Like Jim mentioned brad point bits are your friend. Since I have changed all my pen bits to brad point I haven't had a problem. Above all crank your bit in slow. I use 5 minute epoxy on all my pen kits, toothpick and pill holder kits. I also use dental sheet wax to plug the ends to keep the glue out of the tubes.
Retirement: That’s when you return from work one day
and say, “Hi, Honey, I’m home – forever.”
To succeed in life, you need three things: a wishbone, a backbone and a funnybone.