I picked up this 1948 Royal KMM for $25 at a thrift store some time ago. It was in tough shape. Very dirty. I removed the platen to clean under it. I had to reshape some parts so that the paper would feed smoothly. In the end, and in spite of some small rust underneath, I got it working quite well. The mechanics are smooth and responsive. I enjoy typing on it. There was one irksome problem left. There were two inescapable divots in the platen. Letters were not showing when the slugs hit the divots.
Yesterday I finally tried an experiment I had been considering. I filled the divots with superglue, let the glue dry, and GENTLY smoothed out the spots out with a copper Brillo pad. The results are not perfect, but the letters show up nicely. Otherwise the platen had been in excellent shape. It seemed a waste buying a replacement.
Now I partly would like to keep this machine, but I’ve offered it on OfferUp. It will serve someone well.