sch 40 PVC base, some 1" pretty rigid black open cell foam(what i found laying around from an amazon box), laminate the whole thing together with Goo glue, an Goo it onto the original pad. Cost zero. time about 30 min except for cure time. Stuck on like a barnacle on your outdrive. If i didn't like it i knew i could cut it to a better size or slowly peel it all apart with no damage to the original pad. But insane good recoil reduction and raises it on my shoulder to give a good cheek weld. even full size buck shells are easy to take. when i shot full length buck last time my shoulder hurt for a couple days. now just a hard shove.
PS there is a whole thread about butt pads but I think it is on KSG not KS7 posts