Replacement fan wheels from MALOSSI and POLINI have better friction values due to their being made of aluminum - which also increases cooling efficiency in the whole vario system. This should take care of softened up belts, even with advanced tuning.
Not only for hard core tuners - this fan wheel is a good choice for original motors as well.
SIP-TIP! New vario nuts, special Kevlar fan belts, additional vario weights for individual tuning, positioning tools.