What size is the thickest thread that this bad boy 15 91 can take?

>>926733
Also what is that metal spring thing for on the right?

Not sure, but there is copious amounts of docs available for these old singers.

My dad used to sew fuckin leather with his. It's a worthy tool.

>>926733
Thread thickness is dependent on the needle, not the machine. So get a needle that can handle thicker thread.

>>926743
Thicker threads wouldn't cause problems in the bobbin hook, case, etc area?

>>926746
It would need to be a really really thick thread before you get problems with that.

>>927015
>inb4 OP wants to sew with nylon rope

>>926733
>tfw nightmares about getting my finger stabbed by the needle from a sewing machine

I am triggered OP. 4chan needs to add <trigger warning>s to images.

>>927458
I've had it happen, its not as bad as you think. I do carpentry too and catching your finger with a hammer is worse. You bleed a little but after that its just a cut. A hammered finger hurts for days.