The datasheet looks the same and I have bought a copy - thank you.
In regards a spring balancing the tonearm, there might be possible, I just haven't had a close look yet. I have bought an X5M and when it comes to re-assembling the tonearm I can see what's needed.
I think I have found a copy of the service sheet too at
http://www.shopingathome.com/Circuit...0Lists/HMV.htm
N.