I have just aquired a Singer 17-23. It seems in good shape and I'm pleased with it. I think it needs to be timed and it's shredding the top thread though. It came with #22 needles which according to my chart I should be using 138 thread. The bobbin was loaded with 69. The Singer manual says it will take up to a #25 needle. That would mean it would take up to 277 thread. I didn't think these machines were that heavy duty. Soooo, my question is how do I find out how to time this thing. I'm enjoying messing around with it but the model is new to me and I'm rather new to sewing machines as well. I am fairly mechancal and it seems simple, yet I'm in danger of tearing out my few remaining hairs, without some form of reference material. I'd take it to Bob but he's 160 miles from me and I can't take it there every time I screw it up. I'd include pictures but I can't figure out how to do that on this site. I'd appreciate any input I can get on this machine and any direction toward more info.