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I thought it might be useful to post all the helpful "stuff " that we have built or bought. You know things that speed things up or make life easier.
This first simple jig is just a round scrap of MDF that I cut a cove into that in turn fits a 3-1/2" diameter hole with a 1/2" round over, for recessing terminals. The key is a tight fit, and then drilling the holes square with the plywood, that way I just drop it in, square up the plywood portion with the cabinet and drill. This one has two sets of holes, one set centered and another offset higher.