your right - pics make life a little easier when explaining, just snapped these with my phone so not great quality.
I am trying to plug this minijack (end of PTT switch/speaker line on Gecko) has threaded shroud....
into the input on the top of the M91D - again threaded to accept a threaded shroud.
I could butcher the cables if I get components, but would much prefer to have an adaptor /conversion lead.
I think the threaded aspect of the components is pretty important ref waterproofing.
Yep ...I can give Icom a shout - they were not particularly helpful on the stand at the Boat Show when I asked them about this, but maybe they were not the best peeps to talk to.