there has to be a way to make your own rings without getting raped for 4 rings for 7 bucks. what do you guys use? what kinf of paper/cardboard is it? i have looked at michaels but failed to find what was close enough. my hobby shops local suck they carry crap for making rings r fabricated rings at that for say a bt80, with a large motor mount. i am building a super bertha. i have my fins cuy and sanded perfect but need some help with my motor!