1968 Plymouth GTX

[oldbee]

So, the curved rocker blades fit in slots in the base of the antenna, then that is installed from below the fender. I typically screw in the mast so I can hold the lower parts up from above the fender, then the top bezel keys into the two notches in the antenna hole in the fender & the blade on the bezel fits into the slot on the top of the rocker, everything interlocks so nothing rotates... Then the tube nut is installed ...


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Exactly, no “spacer” needed on OE setup.

 

['68 Coronet R/T]

I did figure that positioning of the curved blades out because I couldn't get the top nut to even start on the threads without doing so.
Everything snugged up nice and tight except the mast nut. This made me question the spacer length.

So are you saying to thread the mast nut into place prior to fastening to the fender?

 

['68 Coronet R/T]

Exactly, no “spacer” needed on OE setup.

I'll take a picture of what I have mounted from the bottom so you can see what I am referring to.

 

['68 Coronet R/T]

Okay, here are the parts I received:

Here they are assembled according to instructions:

The spacer is what positions the curved blades. You can see that there are not many threads showing for the mast nut to affix to and this doesn't include the thickness of the fender metal nor the head of the retaining nut.

 

[1 Wild R/T]

I think the spacer is to long, the reason I thread the mast in early is to give me a way to hold the lower portion from above... The flats on the mast should be fully above bezel, in fact the piece the mast threads into should be exposed 1/8"-1/4"...

 

['68 Coronet R/T]

I think the spacer is to long, the reason I thread the mast in early is to give me a way to hold the lower portion from above... The flats on the mast should be fully above bezel, in fact the piece the mast threads into should be exposed 1/8"-1/4"...

I have spent a lot of time looking for a correct replacement antenna to compare this to. It does seem that the original assembly was shorter overall.
My plan now is to calculate how much I need to shorten that spacer to get enough thread to fully seat the mast.

I will thread the mast on and then measure from the base to where the spacer seats and subtract the height of the curved blades, plus a 1/4". That should get me real close.

 

['68 Coronet R/T]

Okay, I cut the spacer down to 1 1/8" in length. Could have possibly taken another 1/16" but I think it turned out okay.