@madmike1157
Sorry for the lame reply this morning. I'm woking nights and was too zombied out to wrap my head around what you were asking for. The two part quicksteel was definitely the ticket! I'll try to do bettet next time, lol.
No worries, You gotta know I had a plan to use one product in my head when I asked the question, and unless overwhelmingly advised against, would've went that way regardless.
In this case, The head itself is the "wall" that the hole butts up against, so the patch cant be forced through the hole by water pressure. I coulda went either way w/ either epoxy, or a silicone based product and it would've stay'd put. The good thing about the two part epoxy is that there is now a "cap" on top of the hole like a cork in a champagne bottle, as opposed to the plug-like end result I would've had using silicone.