ezmike,
On some of my locos the guide rings or stanchions appear to be nothing more than small cotter pins. The "eye" of the pin should be just large enough to accept the wire for the handrails. For a totally add-on project one would have to drill small holes in the boiler; insert the cotter pin through the holes; separate and bend back each leg and press them flush with the inside of the boiler. Then insert the wire "handrails".
I have found suitable wire (piano wire?) at my local hobby shop. The thinner the wire the easier the forming of the rails, and the smaller and easier to work with the cotter pin.
Bob Nelson
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