jcarp - Yes, I took a similiar path when initially looking into to scales and came to the same outcome. That's what got me interested in some type of free-running timer interrupt. As you found, the RDelay sets how long you have to hold the mouse down 'in the trough' to start auto-repeating. The RInterval sets how often the auto-repeat occurs. With the 'after' interrupt-handler, you can use the scale.get() method to find the current value of the scale. I'd be interested in seeing the new reference for TkInter you've found. I'm still trying to figure out how to allocate a group of checkbuttons at runtime. In this case, the number of checkbuttons is determined by the number of MTs. I have had little luck finding examples that work the way I want.