See my mod here. Very efficient and silent solution. Far better than the original one.
mikec, haven't been in oz for a few years but surely Dick Smith's or any electronic supplier would have the same spec fan for a few dollars?
I can even get them easy here in Indonesia for less than a buck.
adamsky, the mod looks good.
Allready did the divider mod ages ago and have had no problems in 2 years or so but this has gotta be good to improve the life of the unit.
Just ordered a new PBO core today so will do it on both of them if I can find a similar fan.