Very nice Mick. There are two ways that I can think of that are equally as good to stabilize the wood. First is quite expensive if you haven't already got all the gear such as a vacuum pump and vacuum chamber... in fact its still reasonably expensive if you have and that is to stabilise it with stabilizing fluid such as cactus juice. The second way and in fact I've just done it is...
1. cut the blank
2. put super thin ca on the ends
3. drill the blank
4. coat inside, outside and ends with super thin ca
5. when dry, run the drill through it again
6. glue in your tube and bobs your uncle.