Ran into a note on another website were the user bought some collars so his tool rests will always be the right height.
"When turning bowls or other objects that I use the same height on my tool rest for the inside and outside, I sometimes find it difficult to maintain the exact height when moving, or turning the tool rest. I noted on my Drill wizard, by Oneway, it has a 1" ISD (inside diameter) the same as my tool rest shaft. I called Oneway, (1-800-565-7288 ) and ask if one could purchase just collars. I was informed they are not in there catalog,
however one can purchase them at $3.00 each, plus SH. I ordered 5, my total cost was $22.50. They shipped right away, great people to deal with."
Or Place a hose clamp (like on car heater hoses) on the tool post at the desired setting and tighten. This is handy for when you are turning the outside of the a bowl.
THE OFFICIAL NEWSLETTER OF THE CASCADE WOODTURNERS