How to cut your bead sticks into same size pieces every time.

You can make a simple tool that will help you cut your bead stick into pieces of the same size each time.
First you will need a small scrap of timber about 8 inches long, and another small block of mdf to act as a jam or to rest your bead stick against. If you do not have any MDF handy, you could use a domino, or even a piece of tough cardboard. The diagram shows the jam attached with 2 screws, but you could use nails or thumb tacks.
Once you have the block made, draw lines as shown in the diagram to represent the cuts you may want to make depending on what sizes of beads you like.
Then simply place the bead stick against the jam, and keeping your razor blade vertical cut the bead stick on the line. Sometimes I find it better to stand when doing this so I can view the position of the blade from above to make sure it is positioned at the correct angle before I make my cut.
Using a very sharp blade is important to getting a nice clean cut. When it starts getting difficult to make a clean cut, I switch to a new blade.

Remember, this is just a diagram ... so it looks very neat. Yours does not have to look like this to work. It can be rough and crude ... it will work just as well.