closed end length for Jr Gent II?

[txbatons]

Can someone share with me the length I need to drill for a closed end JGII? I'd do it the old fashioned trial and error way, but I don't currently have an extra spring if I screw it up, nor do I have a finished one to guestimate.

Thanks in advance!

PS I tried searching for it, but kept getting error messages.

 

[DCBluesman]

3"

 

[txbatons]

Thanks, Lou, for the reply. I'm on my way to the garage here in a little bit to give it whirl.