As I've been assembling my router with MDF, I've been trying to figure out the best hardware to use. I tried using threaded inserts but keeping everything lined up was a bit of an issue. Here's a link that will show you some knock down furniture screws. The longer ones are about 2 1/2" long which are what I'm using now. They have a nice coarse thread and can be removed quite a number of times. Top left in the picture. They are driven in with an allen wrench. I think I paid about $15 Cdn for a bag of 100.
http://www.leevalley.com/hardware/pa...D=&ccurrency=1
The catalog page is Lee Valley Tools in Canada but any fine woodworking shop is bound to carry them. Lee Valley does mail order and their service and quality is usually top notch.