did you measure the total thickness of these washers you added? I had quite a time finding the right washer/ combination of washers to make up 1.6mm thickness as instructed in NormK's carby mod thread.
G'day Mowerfreak,
Unfortunately, I don't have anything like a vernier calliper to measure them with, but I can tell you that they're mighty thin. Also note that as a service part, a maximum of 4 are recommended to be used, and I'm pretty sure each one is less than 0.5 mm thick. And at retail, they're expensive for what they are, anywhere from $1.50-$3 for just 1. I've seen some wholesalers/distributors selling them for less than $0.20 each haha.
I purchased quite a few so I have spares and so I don't run out any time soon, so I'll try to send some pictures or measure them for you and send something through.
Cheers,
pau13z