FTX Tracer 金屬前CVA傳動軸、插銷及M4螺帽

The pins seated perfectly into the M4 nuts with zero play, and the metal CVA shafts feel like they'll outlast the plastic stock parts by a mile on my basher runs.

The metal shafts feel much sturdier than the plastic originals, and the pins slid in without any fuss. Took a few extra minutes to get the M4 nuts seated right, but the upgrade is worth it for the peace of mind on rough runs.