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Firstly, the GB knob is too tiny and the calibration so fine that the very slightest turn in the wrong direction will cause the machine to fail to Ground Balance properly.
Secondly, a lot of people, due to their level of dexterity, can't turn the knob in the fine way it requires.
The old Tesoro machines used to be fitted with a ten turn Ground Balance knob (potentiometer) but I thought that I read that you couldn't get that component nowadays, which is a pity because I was wondering if fitting such a pot onto my out of warranty spare V3 would make GB'ing easier. However, I've been looking on the web and it is still possible to get those pots but ones of the correct resistance cost £28 each! That explains why the Bulgarian manufacturers, and others no doubt, don't fit them as standard. When I get time, I'll fork out and fit one on my spare V3. It will be interesting to see what effect changing the pot has on the G B'ing procedure.
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http://uk.farnell.com/vishay-spectrol/5 ... dp/1144786
http://uk.farnell.com/bi-technologies-t ... dp/1520669
http://uk.farnell.com/bourns/3590s-2-10 ... dp/1612611
The multi-turn counting dials are pricey, though.
Send me a PM if you're interested in making the mod, I may be able to sort out suitable parts from 'surplus stock'.