Thank to you both for the info. I do have an original ste up on a '47 Revelation...but nothing to measure with really. For the time being, I used a gold Strad rod(backwards) and nuts, althow, the strad theded rod seems a bit loose. I used a bit of teflon tape to make up the gap...on the knob end, I was looking for something a bit closer to the original, and find the Strad nuts a bit massive...may opt for a NY Strad (early) style end cap soldered to the end(discarded the unthreaded end)...or a salvaged old clock knob...at least for the time being I have something to keep the slide from falling off.
Dale; thank's for the photos, I do have 2 of those nickel ones on a model 47 and a 51lb, but really wanted something special for the 45! It will take a couple weeks, but, I'll try to post a photo when I'm done