This has been discussed before. When I overhauled the font suspension on the 4a I could not find a torque setting for the trunnion bolt. The only information in the workshop manual is for the 4 which has a different arrangement with bosses on the trunnion, not a through bolt. For the 4 it is 5 ft lbs and then backed off 2 flats. That is really quite loose. This forum suggested that the 4a is the same as the 6 and the 6 manual says about 50 ft lbs.and that is the setting I used. My front suspension is jaw breaking hard even with the shox set on full soft. I am going to progressively loosen the nut starting with about 25 ft lbs. Has anyone else had this problem?