Sturmey Archer and IGH noob here. I am installing the SRF-3. The directions show two different installation setups, one with a guide pulley set (HSA488) and one with a RH Axle Nut (HMN129). The kit provides both pieces. Nothing in the directions (3810.0405.007), which cover a number of different 3-speed hubs, says which one to use with the SRF-3. Is only one of these setups right or do I have a choice? If I have a choice, which is your preference? Thanks.
TCS's helpful response reminds me I should say I'm installing the hub on a Raleigh Twenty.