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Well, ‘wobble’ is probably a better description of this than ‘play’ I think: It doesn’t feel like an equal gap around the interface (but I’m sure gonna check that!).
Thanks all!
vilms5000-
Either the cranks are a solid unit and they're both moving together in the frame, in which case something's obviously up with the BB, or if it's only one your crank is almost certainly damaged.
If it's just come loose recently, what with those big smooth splines, they might still be up for it if you're lucky - cross your fingers
Kimmo
Lateral play can be taken out with shims between the wavy and the bearing.
If the crank arm wobbles the interface fit is toast.