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Cox controller handle bolts


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#1 Mike Patterson

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Posted 02 March 2018 - 10:26 PM

Are they 4-40 thread? I know this is ancient technology, but I need to know before I take a Dremel to them.


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#2 Phil Hackett

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Posted 03 March 2018 - 03:56 AM

They seemed bigger than that... You can tell by measuring the size of the hex for the nuts. Threaded fasteners are standardized and the nut size is directly related to the thread size. It might take a little searching but you'll find the info. I'd start with McMaster-Carr (www.McMaster.com) and search through the nuts section.
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#3 Pappy

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Posted 03 March 2018 - 08:17 AM

I'd just go to the hardware store and find something that fits the hole.


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#4 Jairus

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Posted 03 March 2018 - 11:01 AM

Or you could buy replacement screws from Parma:

Controller Handle Bolt - 1 Set


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#5 Mattb

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Posted 03 March 2018 - 11:39 AM

You need screws for a Cox controller? You pay postage and I'll send you some controllers. You just want screws, I'll put them in a bag and send them.

 

mb


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#6 drrufo

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Posted 03 March 2018 - 12:14 PM

Are Parma screws the right length? Don't forget there are 4-40 screws for Red Fox and JK handles and they are all different lengths.

 

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#7 Mike Patterson

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Posted 03 March 2018 - 10:02 PM

Thanks for the replies, all.

 

I recently discovered my long lost Cox Mark 5 controller, packed away in a box of old Aurora HO track. I decided to clean it up, and see if I could sell it. At some point, it was exposed to enough moisture/humidity that the handle bolts rusted and froze. After multiple applications of penetrating oil, I was able to loosen the top screw. The bottom one loosened some, but the round head bolt didn't take kindly to the amount of force I was trying to exert, and was starting to strip. When the nut started to turn with the bolt, I abandoned that approach, and got out the Dremel. With it, I was able to grind down the nut and bolt to a point that they finally broke free, and I was able to disassemble the controller. It turns out the existing hardware IS 4-40 thread, so it will get replaced with SS bolts, and either SS or nylon nuts.

 

Sorry I didn't take any pics.


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#8 Samiam

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Posted 03 March 2018 - 10:18 PM

Mike,

 

What color is it?


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#9 Mike Patterson

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Posted 03 March 2018 - 10:26 PM

What color is it?

Smoke grey. Did they come in colors?


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#10 Samiam

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Posted 03 March 2018 - 10:35 PM

Oh yeah. 

 

I have a marbled tan one, green, orange. black and  red ones.  My favorites are any metallic colors.

 

A clear one came up recently. I was out bid by some slot car fiend on the west coast. 

 

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#11 Ramcatlarry

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Posted 03 March 2018 - 11:01 PM

If I recall correctly, the Mk-5 is the switchable ohm model. THAT one I only recall in the smokegrey/black.  The colored ones were the codes for different ohmage resistors, like 7, 10, 15, or maybe 25 ohm.

 

I rewired my Mk-5 years ago for the modern color coding and track polarity.  It still works as well as it ever did in the 1960s.


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#12 Mattb

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Posted 04 March 2018 - 10:05 AM

If you try to sell it, you will probably about break even if you buy new bolts/machine screws.  Cox controllers seem to sell for about 5 cents a pound, as there are about a million of them out there!


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#13 Mike Patterson

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Posted 04 March 2018 - 10:28 PM

Larry, you are correct, it is the switchable ohm model, 5, 7.5, 10 and 15. I rewired mine with a piece of audio cable, two conductors surrounded by a braided wire shield, and connected to a TRS phone plug. That's what my local track required back then.


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