Has anyone built a 79cc Predator with either a Comet or the GTC clone CVT using stock parts rather than shimming the engine output shaft out from 5/8" to 3/4"? I've found old threads on shimming, but none on replacement pulleys. I see that Comet and GTC both have aftermarket driven pulleys that can be swapped in to the CVTs to fit a 5/8" bore CVT output. I haven't yet found a replacement drive pulley for 5/8" engine output shaft. Does it just not exist or is my google-fu lacking?