I sand and polish my flexes except the end that goes in the collet. I sand that part with 30 grit paper. It's very important to make sure no lube makes its way into the collet. If you do and you've got a high power setup, you'll be sorry. (Most people don't realize why a flex slips and most of the time it's due to lube getting in the collet from the flex sliding though a tube with leftover lube)
32" carbon rivercat single 4s 102mph, 27” mini Rivercat 92mph, kbb34 91mph, jessej micro cat(too fast) was
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