May I have the full model # to see if that information is available for you?
Also did other arts fall out when this happened?
It may be the case that the piece of plastic that fell out was not part of the original shower unit, and I have cured the problem by adding to the length of the push button by adding a self tapping screw to it. Please do not carry out any further searches for this problem. Kind regards Tony Hall .
I'm glad you got it going, smart thinking!
Have a great day:-)