The representation of FIGS 2 and 3 illustrates {HEAD ~ the bar} 12 in {TAIL ~ a most forward position}, in which the rear end located stop pin 20 abuts a rear ledge of the lower support 32 and prevents the biasing spring 76 from forwardly displacing the bar 12 out of contact with the housing 
in
The representation of FIGS 2 and 3 illustrates { HEAD ~ the bar } 12 in { TAIL ~ a most forward position } , in which the rear end located stop pin 20 abuts a rear ledge of the lower support 32 and prevents the biasing spring 76 from forwardly displacing the bar 12 out of contact with the housing
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