If you have a wire halyard, I would be concerned with the side pull.. This
can cut into the alum. cheek of the shieve box in the mast head. If the
shieve does not fit properly in the shieve box, the wire halyard may slip
between the shieve and cheek. (this can happen with any extreme side pull)
I've seen this happen.

If you have synthetic halyards the same problem may cause chaff of the
halyard.

My rule is not to lead the halyard beyond what the mast head shieve is
intended for. If I want to hoist something like the dingy, I haul a block
and line or block and tackle up the mast and 'two-block' it and then haul on
the secondary rig. Or if the load is going to be forward of the mast, use
the spinniker halyard since it's attactment is intended to lead off at
extreme angles.


--
My opinion and experience. FWIW

Steve
s/v Good Intentions