Strange problem here and it is more to make sure I am not going mad.

I decided to give my carbs a clean last night. All went well - all disassembled and cleaned. However, on reassembly, of one carb diaphragms seems to be smaller (approx 1 mm less diameter) than the other. The bigger one dropped straight on and fitted perfectly. The second one (rear carb) wouldnt fit properly and I spent about an hour trying to get it to fit by stretching (they dont stretch much), an eventually putting a few small dabs of grease on the rim (oh er missus

Cheers.