Anyone in the plumbing business knows how difficult it can be to remove the diverter/flow control cartridge on the Symmons S96 shower valve. This is especially true if you live outside a city where the water quality is not very good and the valve has been in for a long time.
My son came up with this great idea. He took a metal drill bit that is just under the size of the opening where the diverter is inserted and, with a cordless variable-speed drill, he slowly removed the plastic diverter by shredding it to pieces. On the last part, he put the drill in reverse and out came the rest of it. Then he flushed it out by turning on the valve, greased up the new part and it was done.