I messed up in my question (unknowingly). This morning I stopped at the church and grabbed one of the patch cables that came with our newly installed patchbay (20 rack spaces full of patchbays!!). The diameter is 1/4" but it has the same tip profile that was on the link DonF provided for item 2.
I had gone through some of the Switchcraft site last night, but there were so many types of plugs that were close to what I remembered that it got me confused. TT, MT (0.206), MT (0.25), Bantam, etc. I've never been exposed to anything other than the standard 1/4" TRS, so when we realized we needed more cables I quickly volunteered to build some up, and now I've got to find a source for these babies.
Thanks for your replies.
Darryl.....