I used to tie a piece of line from the mast base to the striker post AND have someone restrain the mast base as I walked the mast up on my 5.O.
My mast is home made, got an extrusion with a different profile, so instead of buying the mast base and adapting it, I just went to a workshop and made one. Itīs basically a plate with a solid cilinder with a half-sphere hollow on it, where the ball fits.
I always use a line, as a safety measure. Raising the mast is not a problem, the crew is usually enough help to get the initial angle, otherwise I use the trailerīs mast support (though a couple more degrees would be better..). But when lowering the mast, for some reason it comes out of the mast step easier.
I prefer not having anyobody restraining the mast base, Iīd rather protect their lives and let the line do the work.