well it went well, just deepened the outer route, and thankfully found my fine wood chisel's (these puppy's are SHARP!)
sliced the corners with my chisels, having my good ones really made that easier
measured the gap, one side had a 1deg angel to it, cut the right size block, test fit, it was good and snug, no gaps, glued, and tapped it in place
thought it would have taken alot longer, course, this just puts me back at square one... no pun intended