Find a independent Omega watchmaker and get a quote from them.
A Omega service centre is always going to be a lot more and not as sympathetic to keeping the vintage appeal and value of a Speedmaster.
Several threads on this over the last few months. Spend a bit of time on here and do a search on Speedmaster and you will learn a lot in a short time.
What country are you in as someone might point you to a capable watchmaker.
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