I’ve been looking for one of these for quite a while now. Finally found one online and I’m chuffed to bits with it. Having a clamp like this for doing intricate add ons for engines and tricky components is a must. £10, bargain. Can’t wait to use it. Made by a company called Neilsen, it has a solid steel base and lightweight metals but very sturdy. (Looks a lot heavier than it looks). Loads of removable pins too for positioning and a expandable clamp section.
f1modlz.com 
I have been looking for one just like that, do you have a part number to search?
Found it on eBay. Just put Nielsen clamp in the search engine and it will come up.