If you are in the US, then John at Camtech will do a good job for a reasonable price. He is a one man operation and is always backed up so when he gets your camera it goes in the line and waits it’s turn. That could be 3 months or more. The good thing is, all OM-1 repairs include a internal conversion to modern 1.5v SO meter battery. That has worked perfectly on my OM for over 10 years now.
If you can stand the wait, and want a completely refurbished camera that will last many years then in my opinion, Camtech is worth the price and wait.
His website is zuiko.com