One method I employ, is the old trick of both the numpad and the caps lock, on and using the shift and control keys manipulate the asset to within a FLEAS FINGERNAIL thats 11/664th's to you Dave, this idea works best on the 3d wireframe mode, but don't try to save it as normal just save as. (IT WILL CRASH THE MED)
Iv'e not had much use with the Snap thing but only in tunnel work, even then I firgit I have it ticked.
Goodluck
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