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I have spent many hours and various valve seals but my Crosman 150 valve will not seal. I suspect that the valve seat itself may have some damage that keeps it from forming a good seal. Has anyone tried to polish or recut the seat in the end of the valve?

I have seen three variations of the Hammer Assembly for the Crosman 150: a single power cocking assemble, a high and low power cocking assembly and I saw a gun for sale on Ebay that had an adjustable cocking assembly. I am not sure how that worked, all I saw was that the part that you pull back...