3in1 is a petroleum blend that migrates and dries to a gummy residue as does its parent company product Water Dispersant #40.
TriFlow, watch/clock oil, gun oil are best.
White lithium grease works well anywhere a grease is called for.
Shutter repair guides instructions for lubrication: Oil-apply a drop and wipe off the excess to leave a light sheen only. Alternative apply oil to felt pad, touch the shaft to be lubed to the felt pad, wipe off the excess leaving a light sheen.
Grease- apply a dab about the size of a straight pin head or less to the surface where metal parts slide against one another or spring ends slide against the case.
Congratulations on getting it fixed.
For those reading this Compur had a special jig for assembling the aperture blades. They lay in place and a breeze that will move a small down feather will displace them as will a slight touch.