Simple to remove unless someone put a stripped allen on the bottom .

Now it is out, question, the roller seems fine, but when I compress it by hand it makes a popping sound and the old box spring noise I could hear when turning engine by hand is gone when it is out.

Is it normal for the pump to make that noise when compressing???

I would just replace it and move on, for the excpetion that I would have to put everything back together (as I have the head ready to be removed) to see if it works - yikes - Don't have that much free time...if I can help it.

As always thank you for any help that I can get.