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For the whole 'The Manufacturer Doesn't let me" aspect of this post, and please correct me if I am wrong (without flaming), doesn't Scuba Pro and/or Aqualung keep a VERY tight leash on who is allowed to have their service kits? I could have sworn that some people who service their own SP regs would say how they got 'secret' suppliers, yet don't mention the names, or refer to EBay for some.
While the mfgr may "unofficially" restrict parts sale (it does not appear to be restricted in the signed dealer agreement) it is the retailer who has the final control in the USA. Few retailers will sell parts yet many parts are frequently available on sites like ebay. In other countries, such refusal to sell repair parts is in violation of consumer protection laws. Unfortunately, at least Scubapro has been successful in stopping online sale from European dealers to USA customers.