This bell shaped spacer, used on a lot of Bally machines
a solid shape (but with a mounting hole) that does not dig into the playfield would be great
I would make it to fit the hole, no need for it rivetpressed to the plastic

no problems Peter - I just need to borrow a sample as can do a silver (shiny light grey) material and can do a 50% fill and it will be rock solid with a mounting hole.