M42 adapter for GuerillaBeam

Designed to adapt M42 lenses to your Guerilla projector, also fits T2 lenses. Clamps the lens, creating a more stable and easier to print connction than printed M42x1mm threads. Could also be useful for attaching your M42 lenses to anything. For more information please see https://gbeam.de/products/m42-lens-adapter/. Update 2015-05-16: revision 18 now easier to print and attach