The representation of FIGS 2 and 3 illustrates the bar 12 in 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 {HEAD ~ contact} with {TAIL ~ the housing} 
with
The representation of FIGS 2 and 3 illustrates the bar 12 in 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 { HEAD ~ contact } with { TAIL ~ the housing }
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