An alternative to the mast pivot pin is to use a bit of 8 or 10mm shockcord, tied through in place of the pivot pin, with a stopper know either side of the tabernacle. The result is that you have a great potential range of movement as you are not limited by a rigid pin.
If it is reasonably tight, it still works as a pivot and is apparently within class rules……….
Trevor
Hofreki
W10686