Put the tool on the BB. Measure the inches from the center of the BB to the center of the hole in the handle. Convert the torque spec to inch-pounds. Divide the inch pounds spec by the number of inches you measured.
Get a fish scale, attach it to the hole on the handle and pull to the pounds you calculated above.
Il faut de l'audace, encore de l'audace, toujours de l'audace
1980 3Rensho-- 1975 Raleigh Sprite 3spd
1990s Raleigh M20 MTB--2007 Windsor Hour (track)
1988 Ducati 750 F1