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Hi,
I did the Rowan belt mod to my HEQ5 (bought new last year). Results were that my pe was cut by more than half to now around 12 arc secs. My guiding figures are between .5 and ,9 arc secs rms depending on seeing.Don't recall what they were before - obviously bad enough that I wanted to do the mod:-) Much quieter than before. The mount now performs like a champ, and am extremely happy with it. I don't know the longest exposure I could take, but I do use up to 10 minutes at the moment.
I did find that belt tension was critical to getting good results, and I had to use more tension than Rowan seems to recommend.
I bought direct from Rowan.
You definitely need the pinion extractor, otherwise fitting is a piece of cake with excellent instructions.
Hope this helps
cheers
Gary
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