Pharo shower panel SkyLine leverage knob.

thingiverse

The attached photo showcases a shower control knob that has become increasingly difficult to turn, especially with wet soapy hands, making it nearly impossible for the user and their wife. To combat this issue, an ingenious solution was devised - an object that slides on and fits snugly in place without the need for screws or glue. Though the handle still needs proper fixing, this temporary solution works remarkably well.