Have you read 'Zen and the art of motorcycle maintenance'? There's a good bit in there about using a shim to stop handlebars from moving. The bike owner was really happy until he found that the shim was cut from a beer can!

Trimming the plastic is the easy part, regaining the original finish is where the skill comes. Messing around with glue and the rubber is no more 'pure' and I think more likely to cause a problem.

Mercedes build quality is not just about precision engineering, it's about careful adjustments and modifications during the build process. In the UK this is known as fettling.

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Cheers, Neil