Build a vacuum box for you hold down needs. Mega handy for everything.
Very simple to do , ply top with 2x2 frame on the back and then more ply to make the box. Draw a tele outline on the top and drill lots of 1/4 holes within the tele outline. Countersink the holes a little to increase the area. Attatch a tube to the side that will let you hook up a tub vacuum cleaner. Thats it.
Rails can be whatever you like , I have used multiple layers of 18 mm ply , sometimes you will want to get higher up so you add another layer.
The sled as mentioned above should be rigid , I use 1/2 steel rods that pass through the router base but a ply or hardwood base is good also.
Tip , don't grip the router when using the sled as you can tend to impart a downward force on it causing gouges. Grip the sled instead. You will most likely need to tape your switch in the on position and use an external switch to kill your power
In the pic below you can see the vacuum hook up at the side and the steel rods , I use much longer ones now. If you do build one of these , and you should as it is multi useful , make sure there is enough width and length to allow the router to travel OFF all of the edges of the body. The vac hold down is strong enough that you can lift the whole caboodle up by holding the body alone. If you want to machine something smaller , tape over the excess holes.
If you want to release the workpiece just switch off the vacuum or pull off the nozzle
