I have a Craftsman 1/4" router with the cam lever lock base. After a couple years of little overall use the lever arm took to popping open
after you started up and were trying to concentrate on staying inside the layout. I put up with this for a couple of small jobs but trying to use one hand to hold it closed was taking away from my none too great routing technique. Had a little free time last weekend so I cobbled together
a fix. Just used a #10-24 tap on the "post" the lever arm comes to rest on
and bent some aluminum to shape of arm with a tab that parallels the post and has a through hole for bolt/machine screw. After that put some JB Weld around bottom of post hoping this would help the plastic accept added stresses. So far so good.