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Many thanks all: Ron, Chris, Stuart, MJM, Jason, Zephyrin and Shopshoe.@ Chris - good suggestion. However, it appears that my shop gnomes read your post before I did, because when I went out to my shop this morning they had already called out NUGGETS (the National Union of Gnomes, Goblins, Elves, Trolls and Sprites). The rep met me at my shop door, his arms folded in determination, and the upshot of the ensuing discussions was that I agreed not to use any of the workers as living shims or packing, on the basis that the gnomes would ensure that the engine's feet are properly adjusted and locked at all times. It was also agreed that should this measure prove to be ineffective, a delegation of the workforce will remove the feet and bolt the engine on to my bench for further stability testing.My view is that this was a satisfactory outcome. The question of balancing of the flywheel (as suggested by Jason and Zephyrin) was not discussed at the meeting but this can always be revisited at a future date should it prove to be necessary.