Rocker covers come off really easily or so I found out later after banging about a bit!
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Remove all the washers from the cover as they are really tight.
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As soon as you have, it can be removed with the simplest of ease!
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As for the shims, you need to replace them with correct size shims.
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In fact IMOC have a Shim Bank, however you will need to do a search on the forum to track down who has it at the moment.
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Generally you take the ones you want, drop in your old unused ones, and pay postage to the next member.
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HTH
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(Hope That Helps)