Hi Alex.
The actuator cost £73 of Ebay.
The claw is made from 3mm steel. It was made in 4 bits. 2 side pieces and a top and bottom piece welded together. I also welded soom internal braces in it. the tips can be changed as they slot in to the end of the claw. The tips are made from 8mm Ti. Got some tips for comps and some flat tips for whiteboards.