The plastic end caps are to cover the grub screws on DF 500 connectors are, well, disappointing. First off, the 4 color choices are all too light. There's no Dark Brown color and that's the one I need, naturally. Second, I'm not sure how well these will stay in place over time. Sure, a little dab of glue will help but then they're not really knockdown are they? Has anyone come up with a better cap? I've looked at Bed Bolt End Caps and that's a good idea, but using a 1-5/8" round metal plate to cover up a 15mm hole is a little overkill to me. Anyone got any ideas to hide the grub screws on a piece of Mission furniture?