Heyco Hole Plugs
Use these to neatly plug an unused hole in a panel. #2603 fits the hole for a standard Alpha M7 x .75 bushing (9mm, 12mm and 16mm styles). #2613 is for the M8 x .75 bushing on the 24mm pots and some switches. #2623 is for Switchcraft #11 and similar jacks.