Anyone had experience about the mast base(or mast joint) getting stuck in the board after session. It s so tight that I can't twist it a bit. 
Any reasons for that and how to twist it off it without damaging the board ?Thanks for help.
Well, the reason I can see is maybe some sand on the screw or in the square bolt but I won't be able to help or give any advice unfortunately...
rubber mallet really light taps. Yes they will stick in there as the brass t nut corrodes bad because it is contact with stainless bolt, in old boards sometimes the alloy mast tracks would also corrode & cause the stick.
