I have an inquiry out to an expert, before I touch this OEM relic with little wear.
But, just discovered that a new (monel) needle in the "metal needle" V-Twin replacement is slicker on top on does not hang up.
• The floats will snap instantly! Bend by holding the hinge area only, using two fingers (bending up, in my case, to decrease the drop of the float to a 1/4" setting).
• Draw a center-line across the bowl's milled surface and establish an exact 1/4" distance at the bowls center-line.
Note: Don't leave the corner of the nut extending beyond the diameter of the float as shown. It decreases shoulder support. ~ Cotten
• Use a wrench to barely move the filter to a position that allows finger-turning the flared nut w/o bind. This is very important. You want to be able to finger-spin the flared nut back after initially loosening the nut with a 9/16 wrench. That means the flare is "plumb".
• Consider hand-painting any (brake spray cleaned) rusted fins. Rustoleum makes a high temp flat-black 1200-degree rust resistant paint, and a hot-rod hi-temp satin goes over that.
• Better than rust. It's unbelievable how much corrosion sets in with a couple rides along Hwy. 101 south of Cardiff, where the hwy. is at sea level. You get none of that east of I-5.