Technical Gearbox parts help please

[andrewdickson815]

Hi all, my gearbox would not select reverse gear. The mechanic removed the selector turret from the top of the gearbox and found the remains of a bush .there is a part number on it but I can't find it listed
He put the turret back on and it seams to be fine.
I'm just a bit worried if the box could fail with this bush missing.
Any help on this please.
Many thanks
Andy