34 PICT 3 re-build advice please....

[Oldman]

Hi all, trying to get to the bottom of the (non) idle issue on my son's '71 DP 1600......stock Solex 34 PICT 3 .
Last weekend I pulled the carb., thoroughly cleaned it and put a kit through it hoping that it'd assist with idle.
It didn't. It starts first kick, runs on choke - no issue and drives beautifully.....but will not idle.

There are a couple of q's that I'd like input on, please......

1. There are two captive BB's in the body of the carb.
    I was reluctant to release/free these and left them as is. ie didn't clean them.
Do these have anything to do with the idle circuit ?

2. The Main jet and Idle jet did not have O-rings on them but have a shoulder that (to me) looks as though there should be O-rings in place.
    I put O-rings on both.
    Should I have ? - The Carby Kit did not have O-rings in it other than for the Idle /air adjustment screw ( the larger of the two).
    The replacement Mixture screw had an O -ring already on it.

I'm going to pull the carb down again tomorrow and check if I've missed anything, so any advice is greatly appreciated.