[carmine]

Heres a tip.

When to do the twisting of the throttle shafts?

Only after a good run of car with engine properly heat soaked to operating temp. Then shut off and allowed to heat soak for about 10 min so carb bodys get hot.
Only then should you twist the throttle shafts.
Then allow to cool down for couple hours before re-assessing were your at.

This minimizes the metallurgical stresses on the throttle shafts and allows them to maintain there newly twisted position.