I have literally one thing preventing me from finishing my full bed/bath reno and it's that my installer used 1" of thinset instead of 3/8"- so now my shower valve is too deep in the wall. The water separator, mixer valve, and metal sleeves are now too short to fit the faceplate and handles. (see attached photos) No replacement parts store has been able to help and the company (Artbath https://www.amazon.com/gp/product/B07M9T4RW9/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1) seems to be located in China and not at all helpful. They don't have standard extension pieces, though they claim they are sending me an extension for the top valve and a thinner faceplate - in case that helps. But the problem is with my installation and not the product. I'm trying to avoid at all costs ripping out the stone, cement board behind it, and shower body and re-doing the entire wall. Can anyone help? I need an extra 1"of length on the metal sleeves, and both valve pieces (brass on top and plastic on bottom). The stone is only 1/4" thick so it risks breaking if we try to cut the opening to fit the faceplate. We had thought about putting a rubber gasket between the faceplate and stone but how would you ever fully seal it? I'm desperate here. The job is done but for this one stupid thing.