Hi Gav, I mostly use a 6mm cutter, and if worried about hold down just add a few tags. You most certainly do not need 2x25kw vac pumps, I only use 1 x 3.5kw vac pump, but a 7.5kw pump would be better. Some people rout out a holding sheet for repetitive work. That means routing out a groove slightly smaller than the component and putting a rubber gasket in that groove, that means that each workpiece will remain held in position by the vacuum, and the gasket is left undamaged by the cutter. That sacrificial board can then be saved and used for your next batch of the same items. I hope that mall makes sense. G.