Not that I've found. A couple of radomish tips.
1. Use a bit of grease (doesn't matter what type) on the spring and ball/pin...it'll help keep it there in place in the selector switch so it doesn't drop out.
2. Use a small drill bit and just lightly (use your fingers...not a drill) touch up the detent divots on the body. That'll make clicking into the various positions a bit more positive.
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