Spring loading! Why didn't I think of that? Now I feel really stupid...

The original idea came from wondering how to build a table saw, then moved to "ohh what about a router table as well", before settling on the perfectly sensible idea to combine the two...

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Realistically if I ever made something like this I'd be using a cheap saw/router from B&Q mounted upside down under a bench, but I enjoy working through these kind of ideas.