BOSCH VE GUIDES - Pump setup and fine tuning

[306__xrdt]

great guide a question though in the third pic mine has the ufo damper missing is it needed? what purpose does it serve if fitted?

if stops the revs dropping off so quickly if you let off the gas, hence stopping jerky engine braking . . . .it's not essential just makes for a smoother drive . . .

So on other words if the bolt is longer towards the damper the rpm would get more smoother then a shorter bolt towards the damper then the rpm would drop faster when off the trottle?
Would this also have affect on starting the engine if the bolt is shorter towards the damper?
I have reading in the haynes 306 manual about shimming the damper...

Pardon Uk language norway here