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Ok, sewing machine gurus, I have a Ferdco 900B that I acquired when I bought a guy out, that sews just ok, but doesn't hold bobbin tension very well. I've maxxed out the bobbin tension, I've taken the spring off and cleaned out the gunk accumulated under it, replaced the spring with a different one (that came in a box of parts that came with the machine). Neither of the springs show very much wear, nor does the surface of the bobbin case under the spring. However, the little notch at the far end of the slot under the spring, that the thread is supposed to snap into shows some wear, and I believe the thread is slipping out of it as the thread spools off the bobbin from side to side. Even when the thread is properly in the little notch, however, I can't adjust it to have enough tension. There is no beehive spring inside the bobbin case, and I'm not sure there ever was one. The manual shows to change the bobbin with the opening in the case down, so the bobbin drops right out, which makes me think there was never a spring to start with. The manual also states that the bobbin tension should be set to "slight resistance" when in my opinion, you'll never, ever get a tight enough stitch with "slight resistance" on the bobbin thread. My question is, can I replace JUST the bobbin case, or is it an integral part of the whole hook assembly? And if I DO need to buy the whole hook assembly, will the 441 hooks work? I know that the Ferdco was made from the Consew 754R, but haven't found much online for parts for that machine. The bobbin case itself looks identical to the one in my Cowboy 4500, on which incidentally, I can screw the tension down to where it pulls a pretty tight stitch. The bobbin case for the CB4500 does have the beehive spring, but I don't believe that alone can create the amount of tension that I can get from it, primarily because when I bought it new, the bobbin tension was set way too loose for my liking. Any advice?

Greetings folks, I was wondering if anyone could tell me what these steel wheels are, what they are used for and what type of machine they go on. They have a 4" outside diameter and 1" inside diameter. There are 3 pairs and each pair has a different thickness. Measured them last night, but forgot the numbers after a busy day. I believe the thicknesses are 5/8", 3/8" and 1/4"