You are right, not worth it. Amerex just did a tune up on it for me a few months back. I think 1170 fps does the job fine. Thanks for responding.
Just about all springers will diesel a bit, especially after they have recently been greased. It is not good for them but they will stand it for a time.
Hermann Weihrauch used to make a model which was designed to diesel. There was a port which swung out and you would add a drop of ether. Today ether is hard to find but I have heard you can substitute starting fluid.
I have a couple of dozen air rifles. Probably the best one is an RWS Diana (dynamit nobel) model 48. It is a pretty old design but they still make it.