Thanks for the replies and suggestions. I'm relieved to hear that I don't have a bad pump!
The mouse pad and closed cell foam both sound like great ideas. I also have an idea for using a few pieces of leftover silicone 1/2" hose. I would cut notches out of each end for screw holes to attach to the case. The pump rails would be mounted to the hose via machine screws / nuts. The nuts would be slipped in through the open ends of the hose to catch the screws coming down fron the top. Kinda hard to explain. I'll try to get something figured out this weekend and post a few pics.
Haddy - I'm using half inch hose, 1/2" copper elbows and 5/8" T's so I really shouldn't have too much back pressure. Both blocks have 1/2" fittings also. But, it's a looooong passage radiator.
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