hi guys , i think the sierra rack is very simmular to the mk2 in its simplicity but is a litle longer & to make iether one shorter is preaty much the same & has nothing to do with the outer rods but it is the inner rod that has to be shortend & rethreaded & now the housing would become too long & also has to be shortend , too much work if you ask me
alread have my hans full so i got an mk1 from a friend works just fine & the emperial threads are no big deal. however i will be saving my sierra rack & maybe do that project some other time.
Cheers
Samy