Halocline, some of the major brands no longer carry parts for some of their older products (we carry Oceanic, Scubapro & Aqualung, along with a few others). There are some that parts are no longer made for. That is as fact. It has nothing to do with how "decent & qualified" a tech is. In fact if they are "decent &qualified", they would be smart to refuse to service such regulators.To try to service a regulator by just throwing in parts can be very dangerous. If you want to do that for yourself or take the risk of financial repercussions if someone should get hurt using such equipment, then be my guest. I know some think that dive shops are only out there to rip off people. In our shop, if it can be serviced (with proper parts), we will. If you also read my post, I said nothing against buying used, but just to make sure it can reasonably be serviced, that makes life so much simpler, doesn't it?