Alternatives to official Oris Service Centre

[kamleman]

Hi Guys,
Not sure if this is the right forum, but does anyone have recommendations for a reliable service center that can do Oris at a reasonable price?  I have a flight timer R4118 that needs servicing (seals, pushers,). 

GMT adjustment crown keeps coming off despite going to the official center to fix it...at the same time they quoted RM2,000+ to service the watch, which I thought was pretty steep, considering the watch only costs RM6000+ (or less maybe?) nowadays.

Thanks!