For you DYI-ers... I have tried many methods for drilling a hole into a metal (aluminum/aluminium) LF lensboard but only recently I discovered a great way of succeeding at it. I tried hole cutting circular saws, didn't work well. I tried with a drill press and a special gizmo I got at the Ace Hardware store for good money, only to realize that the shaft of the drill itself was bent. Unfortunately, after ruining another blank.:x Recently though, I tried a Forstner bit mounted on my drill press. After I clamped well the lensboard to a piece of wood and the bed of the drill press, I started drilling slowly (slow speeds are best) so the Forstner bit doesn't get overheated. I continued slowly until it cut through the metal plate. Smoothed out the edges of the hole with a Dremel plus attachment and voila! I have a new lensboard for the Linhof!