I am new to knife making, and have only put together kits before, where you are given all necessary parts to complete the knife. Now I have begun to gather various materials so that I can begin to buy blanks and create my own handles. I recently purchased a selection of seasoned elk rounds off of e-Bay. I have read that before using as a knife handle, you must use a " gap-filling glue " to fill the pithy area of each round using a glue such as Zap-a-Gap PT01. My questions are : 1. If I intend on making a knife using a hidden tang type blade, what is the process for filling a 5 to 5 1/2 inch long round ? Will this glue penetrate the entire length before setting up? Is it necessary to thin this glue further before using, or do I need to get a thinner viscosity glue? How much glue will be needed to fill the average elk round approximately 5 inches long? By the way, my chosen blade blank is a Helle blade with a blade not quite 4 in long with the tang 3 1/8" long and 5/16" wide, 1/8" thick. Also, if this not the best glue, or the right glue, please tell me which is the best. Which size bottle is best? Brand?