How to balance between IDA throats?

[type3]

How do you balance between 48 IDA throats on a single, double barrel carb?

I've seen a video of it done on a triple barrel IDA. I'm pretty sure you can do it on an IDF too.

All help appreciated.

[Bruce2]

The 2 bbl IDA does not have a throttle plate bypass screw, so it is very difficult to match the air flow at idle.
Two ways I have heard of are:
Twist the throttle shaft very slightly to open the slow bbl a bit more at idle.

File a small flat on the edge of the brass throttle plate to allow more air around it at idle.

The second is kinda permanent.

[type3]

Okay, good info. Thanks.