Since we're sharing ideas for tight clearance motor mounts & the like, here's something I've been doing for years (and won me the American Psychiatric Associations "Duh-Aha" Award/Necessity is the Mother of Invention/ Frank Zappa -
But first the backstory : Being a serious "Ltd" Class competitor, several seasons back I experienced the decline in longevity of the later manufactured NAMBA approved "spec" motors which started lasting as long as a burrito outgassing in a windstorm and hence I needed to be able to quickchange kerfuffled motors between heats minus the frustration of looking for that pesky 3mm hex and first engaging , then unscrewing the front mounting hex's 1/331 turns at a time. This is what I came up with (and how I do ALL my motors now) and maybe this could add to your your in/out mount design :
First - get some 3mm capscrews, de-capitate them, red Loctite them into the front endbell to make studs
quickchange stuff002.JPG
Use small box-end to either initially break loose loose or fully tighten
quickchange stuff003.JPG
Make (or find online) a flexible socket drive ( Old hex handle, .150 flexshaft, 7/32 socket)
quickchange flex001.JPG
Go for it
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