Otto - There should be two space filling tension springs and flat washers between the "oiler" and the rockers either side of it to help stabilize it from moving side to side too much.

See the rear shaft diagram from the shop manual below and note that the same needs to be on the forward shaft segment too.
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~ Dan
1951 Chevy 3 window 3100
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"My Grandpa Carl's Truck and How it Became Mine"
1966 Chevelle (Wife's Hot Rod) | 2013 Chevy Silverado (Current daily driver)
US Army MSG Retired (1977-1998) | Com Fac Maint Lead Tech Retired (1998-2021)