I found this, it shows how to replace the diaphragms on our bikes, it is also the cheapest I have found replacements, 60 bucks for 4
http://www.ebay.com/itm/BRAND-NEW-4p...sories&vxp=mtr
http://www.ebay.com/itm/BRAND-NEW-4p...sories&vxp=mtr
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