I should probably put this in a new thread however its related. I'm not the proud owner of a set of mafell/bosch rails but I have dewalt 625E and Trend T5 routers. So I have bought the Bosch router guide rail base. This is pre-drilled with holes to fit most of their routers. So I have had a quick look at fixing my routers to the base.
The conclusion is that out of the box, for each router, by enlarging a hole in the bosch base you could potentially fix the router using existing holes but it is not ideal. The router is not dead centre on the base and the router is at the wrong angel for comfortable use but if you were pushed to do it as a temporary measure it is feasible.
Ideally, drill the base out with new holes with countersinks for the M6 set screws, there is enough meat to do it. I shall be doing that soon.
Once attached the base slides nicely on the rail, the depth adjuster work on one side and the clamp to stop it moving works on the other and if you move the depth adjuster control while its clamped it does twist a little bit so not perfect. I need to give it a go with a router on it to see how much the base moves.
Here's a few pictures. First the DeWalt 625E, you can see the jaunty angle you get by using existing holes.
And here's the holes in the base, the router is reasonably central, not bob on, but close. I have used a woodscrew to indicate the hole that needs enlarging if you want a quick bodge. I am not suggesting youy use woodscrews however the guy who owned my old Fordson tractor before me would definitely have done so! Also this only utilises two of the three holes in the dewalt base, probably good enough for a one off but not ideal, drilling new holes is the way to go.
And here's the Trend T5, also at a nonchalant angle
And the base, this time both holes need enlarging, the set screw shown is only an M5, not an M6 that both router bases take. The Trend only takes two fixings. This time the router is not any where near, central. Again, drilling new holes is the way to go.
I don't think I will bother drilling the base for the Trend, I shall make a template of the Dewalt base and drill it when I get chance . I have some bookcase strips to fit to some oak so I shall do it for that job.