I replaced my Losmandy gear boxes with the McLennan ones 4+ years ago and have never had a problem. The Dec on my G11 is driven by the original motor and the RA by a Maxxon. I had to enlarge the G/B mounting holes as they had metric dimensions and had to make a sleeve to get the output shaft to fit but it was long enough ago that I don't remember much more! I bought the G/B directly from McLennan in the UK, not knowing I could have got them from Radio Spares.
Charles
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