I made one of these myself but it's a bit shit and I can't be bothered to do a better job. Ideally I'm looking for one that has an edge depth of around 25mm that I can do weighted pickups / no hangs with. I'd like the slot to be big enough so that my sneaky fingers can't find a way to cheat by nestling on the sides. The edge needs to be located centrally so that it can be used with 1 arm. I can only seem to find examples with 20mm or smaller edges, or the larger edges are offset and no good for 1 arm. Any recommendations?