Deadbolt - I wish they made 160 Judos! But you are on the right track. You should be able to fit 25 grains of melted something in there. I cut the tip from my arrow taper and drop a bullet weight - the kind for fishing rubber worms - into the judo. I forget which size they are but I found some that are a pretty consistent 27 grains straight from the pack. The pointed tip drops right in and snugs in the judo taper. It will leave less arrow-to-judo contact area for the glue so they tend to pop off easier if I hit a rock. If you melt some lead and get it all the way into the judo it will leave you a longer wood taper to glue. It's nice having judos, Ace hex heads, field points and broadheads that are all matched.