Signal tracer/injector

[Yorkie]

A cheapo router would be fine for a comb-joint jig Mark, as you're routing thin wood side-grain on, with a 1/4" bit. Each slot takes only a jiffy to produce and puts little load on the router. (I've seen pics of your DIY malarkey - pumps and sumps, and land drains in basements and the like. No wonder you're 'rather busy', and of course, you do have the small matter of a day job to perform!).