So tonight I was taking apart the base cap to one of my newest old fixtures. Yet to figure out a brand - brass/copper looking ribbed sides to it and matches some Fresnels I have. Think it's Century or Century strand of the mid 1960's but after that nothing. Anyway, following the MR-16 Gimbal ring concept of removing the track light base off a MR-16 fixture and mounting it to the plate on a 1920's box spot, than optimizing it and a lamp for the reflector (believe 40 degree in that case worked best - have to check a post from a year ago on the specific lamp), I believe it should be possible to do the same thing for Radial Leko fixtures and in this case even use LED and or color changing LED MR-16 lamps for such a thing if not use up to a 150w/120v MR-16 lamp in the fixture if not mounting a small transformer on cord plug or inside the lamp cap. Still the Gimbal ring type of MR-16 housing once one removes the track lighting base is easy enough to jack up as needed to the focus of where the origional lamp will have been. At that point either switch lamp socket and wire into a new one sized to the lamp chosen or just use what comes with the lamp and high-temp splice to a grounded fixture whip. Easy enough to do in all. Measure the filament height of the old lamp in it's socket above the base plate for the lamp plate mounting the socket. Measure where the filament on the new MR-16 fixture will sit and figure out how much to jack it up. Use the origional bench focus screws on the fixture to further bench focus I'm thinking a still 36 to 40 degree lamp would need in focusing. The rest of the fixture stays as it is unless you need to remove the reflector in removing stray light. Following that, you have a fixture that would be a good prop or household light without in a barbaric way turning a fixture into a table lamp stem. Might look into doing that after this show.