I also f***ed it up on one of my bartop build's side panels. Tried to use a cheap router that had good reviews. Turns out it wasn't that good and the depth stop didn't hold so it drifted. I'll be re-doing mine but instead making the groove wider and using glue because I'm not convinced I want it dead centre and would like some wiggle room to centre it by hand, due to it being 18mm ply but the t-molding is 3/4", and one side will have artwork on it.