If I thought my dry clutch was nearing the end of its life, I'd simply buy the whole plate & spring 'Rebuild kit' from TYGA http://tyga-performance.com/site/product_info.php?cPath=72_79_121_123&products_id=1178 £127 is a decent price.

I think Honda still also sells the dry clutch hub & basket (if those are worn), P/Ns can be found in the online parts manual.

I have a brand new rebuild kit, when i get chance I can measure the thickness of the clutch plates.
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Rich
MC21 Track Bike / RS250 NF5 'Spencer', NX5 'Cadalora' & NXA 'Aoyama' / RS500 / Two Brothers Racing RC30