broncopeters

Thanks to you both!

Hey everyone, I'm new here and psyched for all the info everyone provides! Thanks. I just acquired a Cobra Class 26 and am having trouble with the tension using 138 thread. The bottom stitch doesn't seat and the knot shows on bottom. Does this mean that the top tensioner needs more tension? Also the bobbin tension is not tight, but doesn't just give off slack super easily, should it also be backed off? Coincidentally, 207 thread works like a dream and looks perfect. Thanks in advance! Cheers,