kgg

This is what I done which may give you some ideas: kgg

Any software or hardware upgrade is always a royal pain. I just had to change out my C drive and even with a image of the old C drive it was a pain as I also decided to increase the systems memory as well. It's the little things that will get you every time. kgg

I just used my software and doing this using circles gives excellent transition from the vertical lines but using the arc feature can be a problem without using a horizontal guide line to remove a very slight bulge just above the vertical line. I have seen this type of thing occur with my 3 D printers and too solve the problem the printer software needed some tweaking before it gave a nice smooth transition. kgg

It appears that you are doing the arc from the vertical line to the tip of the arc. Have you tried creating the arc from the tip to the vertical line. I don't use your software but use Fusion 360 which is similar. What I would suggest try is to draw a horizontal line halfway between the top of the vertical lines and where the tip of the arc is going to be so as to keep the bend of the arc on the same horizontal line. This also maybe a cause by the laser not being tweaked as good as it needs to be. Just a thought. kgg

Are you sure it is mildew, not mold or a combination of both?? Mold is usually stronger smelling while mildew smells more musky. If it is mildew which grows on the surface and you maybe able to clean it off if it was caught in time but if it is deep within the fibers it is probably mold. My opinion is whether it is mildew or mold get rid of it both can cause health issues. kgg

As Quade said a 550 watt is the smallest size but should be quite capable of doing the work. The first one noted is of a 550 watt brush type servo motors. The second one referenced is a brushless servo motor with electronic controls. Like dikman suggested to get more stitch by stitch control adding a speed reducer or increasing the size of the handwheel is the way to go. I don't use the brushless electronic controlled servo motors as I like to keep my machines a little more basic, hit the go pedal and the machine runs. Motor will not run change the brush's. The electronics for the motor just adds another layer of complexity of trouble shooting when things go south. Depending on what country your in the brush type servo motors may or may not be as expensive or readily available as the brushless electronic controlled servo motors. kgg

I am probably an odd one as I only use synthetic oil in all my machines, new or old. An example is a Singer 29k-71 (1998) that I did own that also had a helper domestic motor installed before being originally sold by Landis. I did do a short video on how it sounded and the ease at which the machine could be hand cranked. https://odysee.com/@SingerSewing:0/singer:a kgg

This maybe not the ideal machine to start out with but for $40 dollars I can't see how you could go wrong buying it. At some point you will find a need for a patcher. These are pretty versatile machines as they can be can be mounted to any flat table surface and hand cranked or mounted to a proper treadle base. Some of these machine were even driven with a domestic style motor mounted to the rear of the base. kgg

I wouldn't get rid of it. If you want or need a different machine and it is taking up valuable space I would grease the Singer up and break down the treadle so you can properly store it. kgg

I would try either a light soaking of the screw with a couple drops of diesel or some synthetic oil for a day or so and then hit the screw with some heat in a safe place. When you have heated the head I would give the screw a couple of light taps with a hammer before trying to turn the screw. I wouldn't be too aggressive as you may shear the head off. If you can get a turn, even a quarter of a turn let it cool then reapply a couple drops of diesel or some synthetic oil again for a day or so. There is probably a proper wrench but as a suggestion if a coin fits in the slot of the screw head I would cut or grind down the coin down too get the most metal into the slot of the screw head and then clamp the coin in a pair of vise grips. Since the handwheel is wobbling I would like Constabulary think it would be best to replace the bent shaft rather then trying to re-straight it once you get the handwheel off. Also check the body for cracks or fractures as a result of the impact that cause the problem. kgg

Since you are in California maybe check out some places like Altas Levy (Atlaslevy.com) or the Cobra Class 4 machine from Leather Machine Company ( leathermachineco.com ). They should be fairly close to you and you could drop by with some of your items and test drive some machines. kgg

The 441 class machines like the Juki TSC-441, Cobra Class 4 or the Cowboy 4500 are designed for sewing heavier items but I think you will need a second machine like a Juki DNU-1541S in a flatbed or a Juki LS-1341 cylinder bed with a flatbed attachment or their clones to cover off your bases for the lighter weight items you listed. No one machine will do everything. If you are mostly going to do really thick stuff get a new class 441 machine and a second hand upholstery class machine and set them up to a particular task or vice versa. kgg

I do agree as I have at auction got good deals and recently got some really nice (600 sq ft of 6-8 oz) leather in approximately 25 square ft hides for 0.70 cad (0.51 cents usd) per square foot as the business owner had recently died. Buys are out there but you need to be cautious. kgg

From you photo's I would say a old long arm Alder 30-1. kgg

I would be very wary. There are a lot of scams around and there was a similar one a couple or so years back regarding sewing equipment. There seems to be a lot of questions that need to be answered. Who referred you, who is he, where is he located, the list goes on and on. If it sounds to good to be true it probably isn't. kgg

All lot is going to depend on i) design / splicing software ii) the quality / type of filament iii) the quality of printer iv) nozzle size v) whether it has a heated bed and most importantly vi) your budget. I use Prusa printers and find them to be really excellent machines. kgg

Why not go to a few tannery's, I'm sure there must be some in Turkey. They would be able to show you leather of various qualities and any defects that occur throughout the tanning process. kgg

Merry Christmas to everyone everywhere. Preparing for the Grinch Storm here in Ontario. Stay Safe. kgg

Thickness and most importantly breaking strength. The V92 has a breaking strength of 14.5 lbs. while V138 is 22 lbs. A good chart for needle and thread size selection can be found at ( www.tolindsewmach.com/thread-chart.html ). kgg

I looked at their website and didn't see what size and type of needle they supplied with their machines. For that machine the needle system needs to be a 135 x 16 for leather where as the 135 x 17 is made for fabric. I would suggest a buying V92 and V138 thread for your needs. A excellent thread made in the US and Canada would be American & Efird ( www.amefird.com ) which you can also get from places like Wawak ( www.wawak.com ) in either bonded nylon or bonded polyester. Bonded polyester offers better UV protection then bonded nylon. kgg

I am not familiar with a Singer 25KY needle. The needle from the info I have seen for that machine calls for a DDX1 needle system and for the thread V92 that you are using in a size #19 or #20 or #21 depending on how thick a material you are trying to sew. The needle needs to be inserted so the long grooves are on your left and the thread is threaded from left to right, Page 5 and 6 of the manual I have attached. kgg Manual Singer 132K6 Seiko SK-7 SK-8 SK-26 - II (1)-1.pdf

First what size thread are you using with what needle size and system? From the last photo it appears you have the needle in backwards. A better photo of how you have the needle installed would help. kgg

I have been following your progress from a barn find to a beautiful old iron machine and the job you have done is just excellent. kgg

Make a trip to a sewing machine repair / sales shop. kgg

I honesty don't know. I've never dove into that aspect. kgg