G'Day Fraid...
One can answer this question by drilling a tiny (1/16") hole into the area in question... no theoretical discussion required, and you will really know what is in there! Then, coat a suitable bit of hardwood dowel with
epoxy, shove it in the hole and after it hardens, chisel it off flush. Oh, you can do it from inside or out, but I'd likely do it from the inside where it doesn't show, and can't possibly let
water into the insides if the
epoxy should not seal.
Cheers, and good luck in your quest
Jim and Ann s/v Insatiable II lying Gladstone Qld Oz