I have a warning light that comes on when the starter is engaged so I can spot a stuck relay, but it will not spot a problem with the starter drive.  Since this problem seems to be relatively frequent with the IO/TSIO-550 engines, I guess I should plan for a future problem.

I would ask the assembled highly knowledgeable participants for their experience and whiz-dumb:

1) who do you recommend for rebuilding Continental starter drive adapters,

2) how long did it take, and

3) what did it cost?

Forward Planning Fred