Cup drink holder Cup Clam
The CupClam drink holder can be mounted in either horizontally or vertically-mounted StarPorts, to hold mugs, stubbies, wine glasses, even wine bottles. The extendable fingers hold the taller items in place, yet everything collapses into a convenient flatpack for storage.
It will also fit into the top of sheet winches !
If you can’t hold your drink, the RAILBLAZA CupClam will.