dry fitting
sometimes a good way to find out where to drill
...the hole for the mixing valve...
is the transfer method.... if ya can do it....
(dry run)....
you can dry fit the shower stall and slide it over and against
the plumbing nipple that has a little tooth paste (or drywall mud)
on it
...until it leaves
a witness mark (glob) or transfers some toothpaste (or mud)
onto the backside of the
shower stall wall... thats where you'd drill your pilot hole.
and it gives you a way to double check your measurements.
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