Ok here is my collet with the dimension of the nut. I measured the collet and it is 24 MM. When I look at the chart it does not seem to match up. Is that why this was so inexpensive is because it is an off size?
Yup --looks like a non-ER collet, and the fixture is not likely (but possible) going to let you get much larger in diameter.
I looked at one in the Tucson Woodcraft once upon a time, and the owner did not know the collet series. He is a pretty skookum guy. You might contact Woodcraft national customer service to see if you can get more info. Remind them that collets are an expendable item that need to be replaced.
ER collet systems have larger capacity with greater numbers. ER40 is bigger than ER32 is bigger than ER25 etc. ER one of numerous systems use by the machine too industry but it is the one that Jerry Beall selected to adapt to wood lathes many years ago. Jerry still sells them. CUSA and PSI sell a clone version. Have also seen some nice rebuilds that machinists have produced from surplus collet bodies.
Do go for the version that threads onto your headstock. Jerry sells the common sizes and the clones have inserts. Is you go for a clone, the CUSA version is threaded for 1 1/4 by 8 with an insert to fit 1 by 8. The PSI is 1 by 8 with an insert for 3/4 by 16. If you have, or think you might get a big wood lathe with a 1 1/4 by 8 headstock, go with the CUSA.