My monitor arm ate my desk corner, so I built a fake one
Last month I clamped a cheap monitor arm to my desk and it crushed the particle board edge after a few days. I panicked and tore the whole setup apart, but then I cut a 2x4 block, painted it matte black, and clamped it underneath to spread the weight. It looks janky but the arm sits solid now, and I only spent $8 on paint. Anyone else rig a support beam under their desk instead of buying a proper mount?
The part about it looking janky but sitting solid is exactly where I ended up too. I did almost the same thing a couple years back when my arm started dipping and I noticed the desk top was bowing right where the clamp sat. I grabbed a scrap piece of 1x6 from the garage, cut it a bit wider than the clamp plate, and ran it under the top with a couple of long bolts through the existing holes so the load spread across a bigger area. It's held up fine for two years now, way better than the thin metal plate that came in the box. Honestly as long as the block is wide enough and you tighten it evenly, that particle board doesn't care what it looks like under there.