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Discussion Starter · #1 ·
Hi everyone.

I'm new here on the forum and hope there is someone who can help me.

I have a Honda CX500 from 1980, where I would like to mount a license plate holder like this one.
Arm Human body Automotive lighting Eyewear Hood

But it is for a 20 mm axle.

It has been done on the Honda CX500 “Betty” by M8 Design.
Tire Wheel Fuel tank Automotive fuel system Vehicle

But unfortunately I do not know how.
Hope there are others who also have done it who can tell me how.
 

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Discussion Starter · #2 ·
Is there really no one who has done this in here before who can tell how?
 

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Discussion Starter · #4 ·
Hello.

Thanks for your reply.

But it must be as in the picture as I have already bought the holder in the picture.
It is a highway hawk license plate holder. But it is for a 20 mm. axle.
The axle on a CX500 is not 20 mm. but it can obviously be done.

The problem is that there is not much room to put anything in between where the axle and bolt are.
I don't know if they have had a spacial nut made with a larger diameter, or how they have done it.

But thanks for your suggestion.
 

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1978 CX500 "The Grub", 1983 GL650I "Nimbus"
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I'd use a flanged collar, 14mm ID, 20mm OD. Cut down the shank to be shorter than thickness of the plate of your holder, so the flange can pinch the plate. This will center the holder on the axle, adding minimal thickness under the axle nut.
 

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Make sure that the axle nut still has full thread engagement after modifying the holder.
 
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Seems a different length bolt easily solves this dilemma, no?
 

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Seems a different length bolt easily solves this dilemma, no?
Can you suggest a donor bike for a longer 14mm axle with the correct head?
 

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Discussion Starter · #9 ·
Thank you very much for the good suggestions.

I think it ends up I will to do as Randall-in-Mpls suggests.

I have ordered a narrow castellated nut, so there is a little more space so that there is room for the license plate holder.

Thanks for the help.
 

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If the flange adds too much thickness, you can use a shallow, unflanged spacer, but it might be more difficult to install.
 

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Discussion Starter · #11 ·
Randall-in-Mpls I'm not 100% sure what you mean and what kind of part you would recommend.
But I assume it is something like this.

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I don't know if you can buy something like this.
But i think I can get someone to make it on a lathe.
And then I hope the new castellated nut is not too wide.

Auto part Art House Circle Metal


Can you possibly link to one like you mean, so I'm sure i understood you right.

Thank you very much for your help.
 

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'84 CX650E that is evolving into a GL500
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I think I'd weld the hole in and re-drill it to the correct size. I wouldn't want to make the axle nut have any less threads than absolutely necessary.
 

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Discussion Starter · #13 ·
It's also a really good idea
If you can weld and have a welder, it also requires that you powder coat it again.
I wold also prefer that I didn't have to use a nut with less threads but then i can't get the safety pin in the hole.
But I'm not so worried about it, as it can't fall off when there is a safety pin in it.

But thanks for the suggestion.
 

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Your drawing is exactly right. I doubt you'll find one the correct length (no more than a couple mm, I imagine), so you'll need to cut down a longer one. Or turn one from rod stock, if you have access to a lathe.
The flange should be as thin as is practical. It's only there to hold the spacer in place during assembly.
 

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The flange should be as thin as is practical. It's only there to hold the spacer in place during assembly.
No real need for the flange on the collar. Axle in place, slide the collar onto the axle, then place the license holder over the collar and install the axle nut.
 

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I suggested that in post #10, but I believe the flange would make it easier to work with.
I think Bob's suggestion is the best option, if you have access to a welder.
 

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Discussion Starter · #17 ·
Thank you for all your help.
I have now tried what Randall-in-Mpls suggested.
To test it, in the first instance, I 3D printed the washer on the picture, it must of course be made of metal.

Vase Wood Artifact Jewellery Circle
Watch Gas Font Metal Fashion accessory
Automotive tire Circle Gas Rim Household hardware


The new nut is perfect, it gives exactly the space I needed, and it is stronger than the original so I am not nervous about the threads.

Automotive tire Hood Automotive lighting Tire Vehicle

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Thanks.
 

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Could you tell me where you got this holder? I found some but none identical to this one. I like it, looks simple and clean.
Thanks!
 
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