said valve housing further having a stationary upper stop and a movable lower stop projecting outwardly from {HEAD ~ said front side} of {TAIL ~ said valve housing} in the direction of said axle, said lower stop being angularly spaced from said upper stop and being adjustably mounted on said front side of said valve housing so as to vary the angular distance between said upper and lower stops 
of
said valve housing further having a stationary upper stop and a movable lower stop projecting outwardly from { HEAD ~ said front side } of { TAIL ~ said valve housing } in the direction of said axle , said lower stop being angularly spaced from said upper stop and being adjustably mounted on said front side of said valve housing so as to vary the angular distance between said upper and lower stops
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