It's a b*gger when that sort of thing happens !
Geo, it might be better to make the mast by carving, filing and sanding some sprue, stretched slightly to reduce the thickness, as the plastic card version might distort at some point.
I've had to do this in the past, and did the shaping at the end of the 'thickly' stretched sprue, allowing a good length of 'spare' plastic in order to hold and work with the part. Once carved and sanded to shape, it can then be cut off, creating a 'pin' on the bottom to aid location.