Toolmaker,
I thank you for your input. Its possible the machine may have some backlash but I have not noticed any at this time. The machine was purchased new and is about six years old and everything appears to be pretty tight. The slot in the clamp is .250 wide and I would think if there were any significant backlash it would simply snap the ¼” end mill. The method you have suggested to correct the condition is certainly a lot more effort but if it will work that’s the way to go.
Shelly142