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05.01.2009, 03:47 PM
The cup on the bottom of the set screws typically used on pinions has sharp edges. Over time (tightening and loosening the set screws) these edges can wear out so they no longer "bite" into the motor shaft. A new set screw is often a worthy fix, and threadlock is always a must.
SH Z-Car, Custom Crawler, 8s Savage, 12s XTM XLB 1/7 buggy, 4wd 4-link rear/IFS Pro4 truck, Custom Hyper 10 Short Course, Belt-Drive Mammoth ST 1/8 truggy, 4s 17.5 MM Pro HPI Blitz
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