Hi Bruce
I was going to suggest one more way to fix this error in the Oak-Park system

but it takes a bit of work on your part.
You did say what type of router you are using in the router table, but this is for the PC router and it work for others that use the brass guides for the 1 3/16" size .
Send off for a new Oak-Park base plate that has the 3 1/8 hole in it, once you get the plate make a plastic or hard board ring to fit under the opening that is 1/4" x 4" OD, and 2 7/8" ID hole.
Now screw the new ring part in place,with flat Allen head screws and LOCK NUTS,once you have it in place pickup some base plates from Rockler and use trim bit to resize them so they will drop into the 2 7/8" opening.
Now you will have all the inserts you will need and you will not need to switch base plates and reline the center point .
It would be best to rework the Oak-Park base all the way by putting in a 3 3/4" opening (center hole) and make the plastic/HB ring a bit bigger, this way you are set for the big panel bits as well, but it will take a bit more work because the opening MUST be dead on.
You can do this with the new base plate as the templete and the brass guide and a rabbit bit.
NOTE***don't use the one you now have you will need it in place to make the ring and to rework the new base plate.
http://www.rockler.com/product.cfm?page=6236
Below you will see one I made for one of my router tables ,it's not the same but I did use the PC black plastic base plate to do the same thing.
http://www.routerforums.com/table-mounted-routing/2766-whats-best-way.html
Bj
