I appreciate you're kind remarks,you were correct in not seeing any filler, I find that filler sticks out far more than an imperfection. Mistakes I make plenty of, for instance when making the cufflink box as a Christmas present for a good friend, I made the top then measured it and made the bottom, but when it came to assembly, the bottom was 20mm wider than the top! I had measured from the inside of the frame and cut the piece of Sheoak to that size. I was now faced with the problem of how to rectify matters, because of the mitred frame it wasn't possible to cut accross on the radial arm saw so I considered using jig saw, band saw, scroll saw etc. but non of these methods would leave a perfectly straight edge so I went back to my training under the master of the router, Tom O'donnell (template Tom) and decided that the router was the only way to solve this problem so I made the template shown in my posting to Tom and using a 40mm template guide and a 6mm cutter routed out the surplus material as also shown . By the way, I do measure several times but still make these mistakes, not surprising at 73 years of age.