833 tranny, reverse detent ball retainer???

I want to replace the gasket between the big nut on the reverse detent ball/spring retainer. Whats the trick to doing this without dropping the ball into the tranny?

You need to remove the small bolt first and fish the ball out with a magnet.

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You need to remove the small bolt first and fish the ball out with a magnet.

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Should the tranny be in reverse first?