Super Autavia dash chrono advice

Delroyb

Evening all. I just picked up a near mint Super Autavia, the second generation with the Cal 5 movement. It is great working nick, the only slight issue being the chrono reset is a little erratic. The cam is resetting exactly, so I think the elapsed sceond hand is slipping a little. Does anyone know of a watchmaker in the UK familiar with these pieces? I would reset it myself, but the bezel/crystal removes as one, and I have no wish to bugger a piece like this up.