It is also possible with a balsa core to pick out the core with a bent wire or other steel curved hook going into the side wall of the hole so you don’t have to over drill from either side. You have to make sure you get it all so the epoxy will seal the core. Hard to do with a small <1/4” hole but i have managed for 5/16 and works well on 3/8 and larger. Then put tape on the bottom and fill with epoxy and redrill when cured. Useful when you can’t get a drill to the underside and don’t want to overdrill the top as discussed.
Nathan Post S/V Wisper Lynn MA USA Thanks to all of the subscribers that contributed to the list to help with the costs involved. If you want to show your support to the list - use PayPal to send contribution -- https://www.paypal.me/stumurray Thanks - Stu
