I know it is easy to open the pump body and expose the impeller. I remember vaguely how somebody did it some ten years ago to replace a worn out brass impeller. The pump is a brass unit.
Would the seal be normally on the inside of the pump, behind the impeller? If so, how do you remove the impeller? Once the impeller out, would it be a matter of just removing the old seal and sliding in the new one tapping carefully? Any need for silicone grease or the like?
If my imagination/memory fails me, how is it done? Or is this something better to be left to an expert?