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Looking to see if anyone is selling a Cobra Class 18 (preferably) or a class 20. Located near Iowa would be fantastic otherwise would need to ship. Wanted to check if any are for sale before I would look at buying new.

For Sale 2 COBRA Class 18 Compound Needle Feed (Triple Feed) Walking Foot Sewing Machines for $1100 a piece. Both machines are in excellent condition and located in Huntsville, AL. Features: Sews up to 20 oz. (depending on material) Compound Needle Feed (Triple Feed) Walking Foot Big Bobbin (M style) Uses thread sizes from 69 to 207 Safety Clutch for hook protection Digital D.C. Servo Motor Heavy Duty Speed Reducer Flat Bed stand with locking casters LED light Thread stand and bobbin winder

Hi, Posted on here a while back but couldn't retrieve my login details so here I am with a new account. Hoping I can get some expert opinion on what is going wrong with my Cobra Class 18. Basically we are having tension issues every few seconds while using it. We will be stitching and there will be a small 'thump' from the machine which will result in the tension going slightly off and showing an inconsistent stitch. The stitching is for a product that we are trying to sell and we can have these issues constantly keep being a problem. We've fought with this issue since we got it and after having a technician come and try and address things on two occasions, and helping temporarily, the same issue keeps coming back. The tech that came said it could be the servo motor and would recommend removal as a fix............ I've made a video (apologies for my drab presenting style!) to show the problem: https://www.youtube.com/watch?v=IjTBUKUask4 and would welcome anybody's opinion on what might be going wrong (what I might be doing wrong) and how I can permanently fix it. All I need is a 100% consistent stitch. Nothing fancy. The video is deliberately non public on YouTube and only accessible via the link in this post. I'm conscious that Cobra is run by good people and I don't want to be detrimental to them, but I still need a solution. I'm not out to adversely impact anyone. This is super frustrating and is holding us back. Any help, no matter how small, would be greatly appreciated. Thanks in advance from the UK. Grant