Danny D. wrote:

On Sat, 10 Nov 2012 00:07:04 -0600, G. Morgan wrote:

Most installers use a cordless impact driver, with 7/16" lags.

I don't understand what a 'lag' is?

Are you talking about lag bolts?

If so, why would lag bolts be involved in switching out a broken torsion
spring?

Because you are going to have to take off the whole torsion bar and
bring it down to the ground level. They are 3" lags and sometimes don't
go back nicely into the same holes.