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cruffiton
Update,
The original rear hub on our Jack Taylor 650b tandem had seen better days, also the gearing and strength limitation of a 7 speed hub were looming... After some eBay trawling for a while we are running Shimano 10Sp on NOS HF08 hubset with a NOS Arai drum... The original drum was near useless and overheated to the point that it fried the bearings a dark brown! We've tested this already on some smallish descents and the Arai can take a lot of heat...
http://smutpedaller.blogspot.co.uk/2016/05/jackyl-tandem-part-10-rear-wheel.html