XRAY - Model racing cars

I was testing my drive train while the car was on a stand.
I noticed that the outdrives from the one-way are able to travel from inner position to outer position over about 3-5 mm (or more).

Is this normal or did I do something wrong

Did you (you should) use the plastic spacer "washers" on the one way? These reduce the movement - but a small ammount is acceptable.

They are 6x9x2 plastic shims and you can find them in the

Bought the kit 2nd hand.
Have a bag with parts.
Saw the washers in the parts database.
Can you tell me how thick are?
Then I can pick the right ones from the bag.

I bought a oneway that was new in the package from our race director. He still uses the original T1 and tons of original parts.
The model he gave me was 305100 that has been replaced by 305101
and it didnt have any spacers or anything in the package. Just the pulley, oneway bearing piece, 3 screws, and the covers. Do I need to pick up some of the shims now?