[Healeys] BN1 on the road again but problems with jumping out of second gear

[Noel and Helen standfast]

Hi listers

this week we registered our BN1 after a two year restoration and it's 
great to be in a big Healey again.  The car had been sitting in pieces 
in Brisbane since 1977 and without the help of fellow Queensland Healey 
Club  members and members of this list, it would still be that way.  
We've had a few six cylinder Healeys over the years but this is our 
first 100 and I'm surprised what a pleasantly different driving 
experience the four is.  Still a long list of things to finish and bugs 
to sort out as usual but generally all systems work as they should.  
Only disappointment is despite having the standard three speed gearbox 
reconditioned it jumps out of second gear on the over-run, I'm told this 
is a common problem with the BN1s.  I note the manual mentions the 
selector forks/spring as the likely problem, is this where I should 
start and can it be fixed with the box in place?

thanks


Noel S