Idle adjustment screw tool
 

What’s everyone using to adjust the driver’s side mixture screw? I’ve been using a 45 Deg turning tool on my ‘66 but it no longer fits in there since I installed the correct brake booster fitting on the front carb.

I use one like this. You can sneak it in straight from the front on the driver's side. None of the included pieces need to be used, as the end fits directly on the mixture screw.

Perfect, thank you! Can you please tell me who makes it? Can't see it in the photo.

Found it on Amazon, thanks again!

On the driver's side, it helps if you turn the power brake vacuum line up out of the way.

I use the same flexible tool,, and sometimes, a piece of 1/4" rubber vacuum hose about 6" long.

On the driver's side, it helps if you turn the power brake vacuum line up out of the way.

I use the same flexible tool,, and sometimes, a piece of 1/4" rubber vacuum hose about 6" long.

That sounds like a great idea. Never thought to use vacuum hose. Thanks

I've hated adjusting idle mixture on a Tri-Power since 1959. So my GMC requires no tool.
I drilled the screw heads and brazed speedometer cable pieces into them.

I use the same flexible tool pictured. I used some red nail polish to paint a reference line on the tool handle. Makes it easier to keep track of adjustments and keep the idle mixture screws balanced.