Simple.
 
do what I do, go to walmart's photo section and find the 3m photo laminating sheets, about 3 1/2" sq. One side is hard clear mylar, and the other is a thinner mylar, also clear but sticky on one side.  I put a piece upside down where the arm is to keep it from getting stuck, then just cover the hole with the square.
 
There's a bump, but its sealed and can be removed. I slot the wrinkle on one edge cause by the arm bump.
 
You can see you servos and linkage anytime you want and you can peel it off with out a mess.   Cheap too.

Gordy

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