NOS Aris 12-21 7 spd any good to you? Not cheap at £40 posted but won't let it go for less just in case I need to buy a new one at some point.
Otherwise I have a Shimano 13-18 6 spd you could have for £24 posted.
Also have a little bundle of NOS Aris 8-speed close ratio freewheels. 14-22, 12-21 IIRC
Completed: 94 Stumpjumper w. M733; ; 92 Dave Yates 731 ; 97 Parkpre Pro-Elite ; Pace RC200 F6 ; Pace RC300; 82 Gios Super Record ; 97-8 De Rosa Giro D´Italia; ; Banani SPX Track bike ; 89 Alan/Mavic Cross Bike ; 05 Focus Cross Team ; 90 Look MI-80 all-Mavic ; 12 Focus Izalco Team/custom build ; 11 Focus Thunder Custom build
Projects : , Brouwer all-Mavic
Stripped : Pace RC303
Gone : GT Karakoram
Stayed in the family: Kuota Kharma, 04 Stumpjumper FSR
Ceased to be : Dynatech MT3, killed by corroded seatstays.