I have acquired a 6″ bench planer (jointer). The wooden frame joining the top to the base has been well chewed. It’s fairly straightforward cutting treated timber to replace it. Another problem was the blades were catching. A missing grubscrew meant adjustment was not possible. A temporary solution was found by borowing the grubscrew from the other handle. The on/off switch is no good and the previous owner had simply bypassed it. I’ve heard that switches on old tanners were not good enough.