Constabulary

Reduce the foot pressure and / or use a roller foot with smooth surface or rubber layer on the wheel Not sure if this one fits your machine https://www.ebay.com/itm/142979318355 Not sure how your machine is set up machine but this would be an adapter for the above roller https://www.ebay.com/itm/145397360986 If your machine is set up with the flip aside roller foot already then there is also an optional adapter for using plain industrial presser feet (f.I. with a Teflon sole) instead of the roller foot https://www.ebay.com/itm/143603134209 with installed foot: https://www.ebay.com/itm/165883555629 If you have a 1 row needle plate and feed dog then this set could be helpful when using plain industrial feet: https://www.ebay.com/itm/143603162021

Seller here says its for the 47w as well (see description) - not sure if the belt for the 47w66 it different but I don´t think it is (not sure though). https://www.ebay.de/itm/122465742879 I just checked the parts list and googled the number. This is the old style belt with metal braces - above belt is the new type made of rubber / neoprene. https://www.ronsew.com/arm-shaft-connecting-belt-235003-for-singer-153w100-singer-153w101-singer-153k101/ However - compare the measures and number of braces and / or check with the sellers.

I have a revolving bush for this machine and other parts as well. I´m in Germany so shipping is not a problem.

I´m sure they are. I would guess the gears are probably old stock (or even old stock aftermarket). You don´t see many 110w's anymore and they have been discontinued for decades. I´m not sure but I don´t think anyone (even the Chinese) do not produce these gears anymore. Ebay is an underestimated source for old sewing machine parts and other old stock parts sometimes.

Ebay: https://www.ebay.com/sch/i.html?_from=R40&_nkw=DRIVNG+singer+110w&_sacat=0 Keep in mind, the stitch length for the 110 was never really long. Do not expect that there was a gear for 5 SPI or so. IIRC then longest stitch was 12 SPI.

@MrHydez If the shaft diameter on your machine is 1/2" then a Singer 111 hand wheel probably could fit. Maybe you need some spacers to align it with the motor pulley (maybe not). https://www.bmfwholesale.com/product/hand-wheel-singer-number-240545/

it can sew heavier - however test it before you buy it.

Do a forum search the Singer 78 and equivalent Consew 28 have been discussed here already: https://www.google.com/search?client=firefox-b-d&q=singer+78+site%3Aleatherworker.net Nice machine (I owned one. Bought just because I was curious but no longer have it) Not many parts are available for this machine so make sure it is complete and it sews. Compare pictures of other machines and make sure its all there. Needle is 135x17 / 135x16. As Alzilla said, you for sure want a different motor and / or a speed reducer. I have a few files: Singer 78 Beschreibung.pdf Singer_78_CONSEW_28_MANUAL.pdf Singer 78.pdf

Or just oil it manually. Don´t expect that there is a video or website for every single sewing machine.

Regarding needle bar - I guess its the same as on my 368 so pull off the top lid, loosen the screw of the face plate (comes form the top side) and bring the needle in bar in the lower position and then you can see the needle bar clamping screw.

BTW - the OEM Pfaff bulb is 62mm long and has a 22mm diameter just to give you an idea. Smaller bulbs may fit as well but I have installed a LED bulbs in my Pfaff 368 and it has a small diameter (16.5mm dia. and 56mm long) and it was a little bit fiddly to install them (grab, push & twist) because of the smaller diameter but it worked. The OEM bulbs on my side of the pond usually were 12V but they come in 220/230V and 110V as well so depends on what your voltage is.

You need bulbs with B15D sockets. At least the Pfaff I know used them. There are also LED bulbs with this socket.

This is what I have. Knob is metal no chicom plastic. 2nd pic is from a 138 parts list. Looks like I have 1 washer extra.

I have a complete lever w. knob and all parts for the 138. Not sure if is is 1:1 with the 238. Can post a picture later

Since the subclass is a rather low number the 29K15 is a very early model and most likely very identical to the 29K4 / 29-4 and similar early 29 / 29K machines. The difference often is just some different accessory and most likely there is no major mechanical difference. Often the accessories that make a difference are gone / got lost over the years so the basic machine often is the very same as more common 29K subclasses with just a different tag on it. Please post some pictures of your machine so maybe we can see some differences to other 29 / 29K machines.