Found the answer I think (not to fix the monopod, but for a bushing that will go from 1/4" to 3/8")
I have an older Manfrotto 434SSB monopod with the dual 1/4" and 3/8" screw on top. The 3/8" sort of slides down to let the 1/4" screw be usable. I tried that (screwing the G1 directly onto the monopod--which doesn't work for me)--and now can't get the 1/4" outer screw part to pop back up. Any suggestions. I've used a small thin object to push down' on that outer part (which is pushed down flat with the head mounting platform. I vaugely remember this happening once before but don't remember what I did to correct it.
Assuming that I can't get that 3/8" back up--is there anything that I can attach/screw on to use a 3/8" head??
Thanks for any help/suggestions.