I've found many advertise their m/c fits drum-drum, drum-disc, or disc-disc. This is confusing to me. All my research says Beltfed is exactly right, so why the universal fit advertising? Are they making up the volume difference with an adjustable proportioning valve? Sorry for the hijack, but I'm facing the same problem and can't afford to do this twice. I've also read not to use a booster smaller than 8" for a disc-disc setup. Can someone educate me ? Thanks
