You really don't need to thread the barrel, I just used a 2 foot piece of aluminum pipe and some gorilla tape.
I did remove the front sight {never used it since the 22 has a scope} so the pipe fit over the barrel and I shot and then tweaked it until I got it on correctly.
I've been using it for over 2 years and it still works fine.
Thanks for the tips and link! I used 1/2” EMT and a friction fit, 30”.
It’s pretty unwieldy, the gun was a long one to begin with, but it sure does work as advertised!