Thank you
@Ab Hoving for another informative advises. Really precious
Looking at Willem Rex is giving me enough evidence and reasons to fit gaskets on all yards.
In term of number of gaskets... looks like main and fore yard has much more of them (9-10) on each side... most likely because of the size and weight of the sails, I guess...
Top yards and spiritsail yard has already less between 2-6.
I will go most likely with 4 or 5 for top yards... and 3 or 4 for spiritsail yard.
Examples from impressive Otte De 7 Provincien drawings.
However... I've spotted little error on the drawing.
On below drawing he drawn 6 gaskets on rigged spiritsail yard.
But on yard drawing itself he has 1 less... so only 5
...anyway... because we were not living in those times, I guess we can just support ourselves with old books, drawings, paintings and models like Willem Rex for reference... and overall draw conclusion for best and reasonable solution.
I have to correct main yard gaskets then... and add rings so each has double
Staples for gasket rings looks like they should be in the middle, but who knows
Again... Otte drawn them in the middle... on main and fore yard, but spiritsail yard has them slightly forward
Looking at Willlem Rex model they seems to be also in the middle.
@Steef66 my goal is to rig the ship as accurate as possible. Rigging accuracy and quality is one of the thing, which always amaze me in models.