Stripped bell housin thread.

[John Mason]

Hello all, On inspecting my Ruby I found a loose stud from the bell housing (Bell housing to gearbox) on further investigation I discovered the threads had been stripped this must have been done at the last time the gearbox was taken out and refitted. Not wishing to transfer blame but I had help and I did not do up these studs.   
Does anybody know any possible way that this can be rectified without again removing the engine. Thus making it a simple rather than a major strip down job.

John Mason.