How to let a Ball follow a Surface?

[ManMadeDesaster]

Hello,

i am currently constructing something and wanted to add a joint so that a Steel Ball follows 3 surfaces while staying in center of a cylinder Perpendicular to the surfaces. I have absolutely no clue how to do that, i have searched for a solution but have not been succesful so i am asking here 😕

(the Pink part moves up and down as well as the blue one)

[etfrench]

If the balls don't move in relation to the holey part, just use a rigid joint.  You can either use an As-built joint or an offset in a Rigid joint to put the ball in the proper position relative to the hole.