Has anyone here tried the GlendelBuck I have a Mckenzie target and after two years I will be needing a fourth mid section already and for $90 a pop I just can'nt do it again. I like the looks of the glendelbuck. same as the block but with replaceable layers that can also be rotated. That and the replacement layers seem reasonable price wise. what Is the lever on the back that locks down the layers made of. Any complaints or comments would be appreciated.