28 - 29 Pickup top irons

[Russ/40]

Attached are photos of my main top bow for my RDSTR/PU. On those photos I have marked in near proximity holes of 1/4" diameter that were drilled for whatever reason. Those marks do not indicate the holes for the for side curtains, or for the two buckles that mount the bow to the stanchions. Are any of these 1/4" holes supposed to be there?

Also, if you have restored similar bows, what did you use as filler for the tack rails?

If you enlarge the photos you can see the hole locations as hash marks on the concrete.