Touching off on manual tool change?

cncbasher wrote:

if your using pcb drills etc , they usually come with plastic collars , you can slide the collars to give you the same length
of tooling for each drill or mill bit ,
for such a simple operation for pcb milling that's the fast way , you can use the auto probe , but without a toolchanger your making matters over complicated .

once you have set your x & y in the touch off , so long as you don't switch off the machine , these points will remain
unless you change them . z is usually set to the top surface of the material , so this varies in use , each value can be set separately .

That is exactly where my problem is coming from is drill bits. I have read you should not snug up the collar to the collet. Is that true? What I try to do when changing bits is to keep the collar close to the same distance \. But is it OK to just snug it up? It would mean a more accurate placement.