i tried inserting the SB foil mast into my BLAST 145 (foil reafy).
using reasonable force I couldnt make it.
sanding the mast head is bad idea since it will be too loose for other boards i use for foiling.
any experience or suggestions?
Is your Blast 145 new? Is stock fin fit well in fin box?
the blast is 2018 or 2017. it is foil ready for sure.
the normal fin is fits fine. going in and out at reasonable force
So, you have to sand foil head, not board's fin box.
motogon but then it will be too small for my other boards
So, it's your other boards boxes too loose, not Blast box is too tight. Try to put Blast's fin into other board's boxes to see difference.