Window Butterfly Replacement

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Window Butterfly Replacement

Postby Elanlover » Tue 13.08.2019, 16:12

Hi folks, just curious what our current status is with regard to the infamous plastic butterfly that secures the window to the motor. As we all know, the clip that bends under the window and slides into place to lock the glass into place is prone to breaking. The butterfly itself doesn't break, just the clip (usually). Has anyone sourced a piece that replaces the clip only? I have looked at circlips/snap rings but the problem I've run into is that, while you can find one with the correct inner diameter, the outer diameter isn't big enough and the glass isn't held securely. Anyone find a better solution?

This part is small enough to be scanned and 3D printed of course thereby creating an endless supply but the issue would be choosing the correct material which is at least as strong as the current piece but flexible enough to bend under the window.
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Re: Window Butterfly Replacement

Postby Fredjohn » Tue 13.08.2019, 17:18

Keep up at the back there!!!

Wayne has already 3D'd them and they are available from his website: M100 shop
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Re: Window Butterfly Replacement

Postby Elanlover » Tue 13.08.2019, 17:33

Fredjohn wrote:Keep up at the back there!!!

Wayne has already 3D'd them and they are available from his website: M100 shop


Ah yes, but they still break! I had thought I read that someone decided to use some form of retaining clip (and keep the main butterfly in place) to do the job that the clip part does. I am getting older though so....... :asleep:
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Re: Window Butterfly Replacement

Postby M100TURBOFR » Tue 13.08.2019, 17:50

SHAPEWAYS also does them. However, don't know how strong they are. Does anyone know?
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Re: Window Butterfly Replacement

Postby HJ2 » Tue 13.08.2019, 19:28

In Nylon... not strong enough.
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Re: Window Butterfly Replacement

Postby Brit-Car-Nut » Tue 13.08.2019, 20:04

They are originally done in a form of acetal. Anything else will not run smoothly in the channel.

The "clip" portion can be grabbed from Toby's drawings and they can probably be printed in nylon, but at £10.00 each from Wayne for the entire butterfly, just buy a couple as spares.

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Re: Window Butterfly Replacement

Postby Giniw » Tue 13.08.2019, 20:12

HJ2 wrote:In Nylon... not strong enough.
They might be made thicker then?
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Re: Window Butterfly Replacement

Postby HJ2 » Tue 13.08.2019, 20:22

No, there is an error in the model
If the model is perfected (exact copy of the original) then a printend Nylon part will work fine
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Re: Window Butterfly Replacement

Postby Giniw » Tue 13.08.2019, 20:26

Ah, OK!
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Re: Window Butterfly Replacement

Postby Elanlover » Thu 15.08.2019, 13:28

I'm wondering if an alternative is possible. What breaks on the butterfly is the "C" clip end. It should be possible to scan that section, do a little CAD work on it and come up with a C clip section with perhaps a tab on it for easy removal. That would remove the need to replace the entire butterfly. When the C clip section breaks, just slide a new one on. Thoughts?
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Re: Window Butterfly Replacement

Postby wayne » Thu 15.08.2019, 16:11

Elanlover wrote:
Fredjohn wrote:Keep up at the back there!!!

Wayne has already 3D'd them and they are available from his website: M100 shop


They may still break! I had thought I read that someone decided to use some form of retaining clip (and keep the main butterfly in place) to do the job that the clip part does. I am getting older though so....... :asleep:


Elanlover, a few years ago, Kelvedon used to offer a clip to repair a broken butterfly clip. They used to recomend keeping the old butterfly and they had a clip to replace the broken part, you could try contacting them to see what they used. They now seem to be recomending the clip that i had remade. These are injection moulded parts and not 3D printed. https://kelvedonlotus.co.uk/product/but ... regulator/

Being plastic, they may still break, not sure how many years the oem clips lasted before they broke. I've owned my car since 2002 and in the Middle East where temps are over 40c for months at a time, I've only had 1 failure of an oem clip on my car and saw 1 fail on my donor car. Maybe they fail more often in extreme cold instead of extreme heat?
Plastic parts here normally fail early.
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