Ummmm, I'm puzzled (Ok. Ok that's not unusual for me I know!). The longrod isn't there for you to line up centre shot (or is it?). I though the longrod was to do with resisting torque during the shot. The tolerances are presumably good enough for the longrod to do its job, rather than for it do do a job we think it would be useful for?
Perhaps I've just confirmed how puzzled I am?
