Thanks chaps - conversion complete (with ground wire - hum is very apparent without it) and very happy with the results. Immediately noticeable to me, when listening through headphones - is the utter silence - not even a hint of noise when at a standstill. One thing to point out re: the brass spacers on the cover screws - these are thin enough to pass through the hole in the plastic base screw holes - but narrow enough for the head of the screw to hold them - so instead of balancing them or taping in place on the screw posts (which seemed to be the suggestion on the video) - place the lid back in place and then drop the screw in the hole along with the spacer so both drop in at the same time - just be careful not to let go of the spacer too early as it will drop down and be out of line for the screw to pass through - worked for me anyway. The table seems to work well with the rubber and felt mat together. I've also bought a digital tracking force meter - based on that the counterweight is .2g out, 1.8g on the weight was actually 1.6g on the scale. Based on the success of this one - I've also modded the Pioneer PL30K removing the internal pre-amp - also a success - will write a post up at some point in case anyone is interested but let me know if any info required.