Been a long time but pretty sure I used my motorcycle valve tool (suzuki gs1000 or honda cbx) to do the shims in my ur back in the early 90's, the motorcycle tools are readily available for around £10 on ebay etc., I still have a couple in my box, if you have the diameter of the camshaft I can measure the tool size to see if its suitable, sorry only got a spare 20v engine camshaft here and not sure the cam is the same diameter.
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