LOL...that had crossed my mind.(the Sharkbite)Or you could just replace the lift up diverter. Unscrew the knob ( #11 in diagram above) and push the #10 thingy out . There is or should be a rubber washer, (#s 13 and 14) which seals off spout and sends water to showerhead. repair or replace.
BTW, I once did a repair on a similar situation where the homeowner had attached the spout with a Sharkbite coupling. Hmmm