I ordered almost the right replacement cartridge. Right diameter, right number of teeth in the spline. Seals line up perfectly. The only issue is this copper bit sticking out the back:

The cartridge

That keeps the cartridge from going in all the way. Can I just… trim it? What does it do, anyway?


If you wouldn't take the time to return it and locate the "correct" cartridge go for it. It looks like it (the pin) keeps the cartridge centered to evenly distribute the load across the o-rings. Make sure there are no seals in the back wall of the housing that could get damaged by cutting it off and give it a try. The worst thing that can happen is that you throw it out if it doesn't work.

  • 1
    It's worth noting you can't return it if you make the change and it still doesn't fit – GdD Apr 12 at 11:20

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