I am currently trying to build the replacement chassis for the 57xx pannier. I have got to the point of soldering in frame spacers but I am unsure which size to use there is no info on an assembly article I found on the association web site, I did find an article in a past magazine but again no clue. I have a choice of 6.4 mm which is the measurement in the yearbook. Or I could use 7mm. The jig which comes with the frames seems to accept the 7 mm one. I have bought both.I don’t want to ruin any parts I have already bought through mistakes or lack of info.