I took a drill to my showerhead! Frikken commies!!
When it comes to showerheads, the best solution is to Drill, Baby! Drill!
I just did some bathroom renovations. The plumber told me that I would probably not be happy with the water flow in the showerheads, and that the particular showerheads I bought had a “foreign” configuration that could be restored by removing a little cartridge. He even told me where it was. But he cautioned me to leave that cartridge in place until the inspection was complete.