My early (56) TR3 has a shift lever that will rotate. Once it rotates, i can no longer shift except into 1st gear. I have to think there is something like a bolt or pin at the base of the shift lever that stops it from turning in its socket. This may be obvious if I remove the cap holding the lever, but we all know about the number of things that need to removed from the interior to get to the bottom of the shift lever. Any insight is appreciated.