So my dad and I picked up a 1980 Prindle 18 for $500 with trailer last winter, we've managed to fix up the rest of the problems with it but it's still missing the forestay turnbuckle. We've tried ordering a couple of the right size but they never seem to thread right.
I know I can order the whole wire/turnbuckle assembly online, but the standing rigging still looks pretty good and I'm not looking forward to spending $90 just to get a $20 turnbuckle.