Whats the Difference SME 3009 S/2 vs 3009 Improved


What is the difference between the different versions of the SME 3009 Tonearms Thanks!
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In the early Series 2, there was a slightly shorter spindle-to-pivot distance, than the later Series 2. There also appear to be some minor changes in counterweight and some small parts. I don't know which parts may be interchangeable. Series 2 Improved has the same spindle-to-pivot distance as later Series 2, but again I don't know which parts may be interchangeable.