I put new bluz oem Volvo air cleaners on with some difficulty and then discovered that I could not retract the choke as the nut holding the air cleaner bolt closest to the firewall was interfering with the choke cable clamp's movement.

So I got some "jamb" nuts, just like an ordinary nut but thinner and thought that would give the clearance required.

But as I was fumbling with the nuts trying to re-install them I wondered why I couldn't get some 3/8" helicoils and thread the carbs so I'd no longer have to cope with those dam nuts. Seemed simple enough an idea, so before I spend too much time figuring out why this is not a good idea I thought you all might have some insight into this.