Got the AN10 coupler today and machined it to fit the PS pump. Bought 2 just in case I screwed up one of them. The one on the right is the one I took out of the pump with the AN8 threads.
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Now I'm going to freeze it and see if I can get it pressed into the pump. The pump inlet is at an angle so I really have no way to press it on my shop press, unless I make some kind of fixture. I may have to try to just drive it in with a hammer .