Joe,

I've also had good success by running a dubbing needle coated with head cement up the length of the "top" thread before I start the twisting process. Then I lay the top thread on top of the dubbing material and start the twisting process. After the brush is fully twisted. I lift the "hand-held" end about an inch off the block and pull it tight and hold for about 30 seconds. This gives the head cement some time to dry and will keep the thread twisted. You can also use super glue for this and the wait time is about 10-15 seconds.

I hope this helps.

Jim Smith