Hi Deejay,
Agree, very strange. I have done some more digging. A guy at my work use to work for MEY in Perth. He was the production manager for around 10 years. He said the SB 45's that arrived from the wholesaler, some (not all) had these counter weighs on them and would always advise the buyer not to remove them because it would cause vibrational issues.
Its probably looking likely that WA did receive a bad batch of clutch housings.
