Homebrew PCBs

How much do the collars vary in thickness? Might it be workable to
add shims to make all of the collars the same thickness? Alternately, 
could the thicker ones be lightly sanded to make them the same height 
as the thin ones?

Regards, Bob

--- In Homebrew_PCBs@yahoogroups.com, "Andrew Mawson" <andrew@m...> 
wrote:
<snip> 

>I sat down to design a screw device to force the drill through the 
> collar until it touches a contact and lights an led, but then
> realised 
> that the collars vary in thickness and the critical reference is 
from 
> the TOP of the collar to drill tip.
> 
> AWEM