I have 2 bathrooms with one piece tub/shower and those DAMN acrylic hand grab bars. One bathroom the bar is all crazed and the other actually broke. After going round and round with plumbing supplies and Lowe's and Home Depot, I finally took the broken one out and adhered hole covers over the holes. Then I contacted a guy that did fiberglass repairs and he did a repair that you can't even tell there was a grab bar or holes there. Granted, there is nothing to grab, but I bet those installed bars wouldn't hold much anyway.