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Cowl Cover Thumb Screw Set

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There are two ways to get an image on the site.

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would produce


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Hi Loren,

Thank you for the posting information. Here's a sneak preview picture of the Cover Hold-Down Thumb Screw Set. This kit allows easy access to the cowl/pollen filter area for cleaning and maintenance. For convenience, the screws are slotted and can be tightened with a 25 cent piece (quarter). Of course, a screwdriver can be used too. The screws in the picture are unplated. However, when finished, they will be black anodized. This kit is a direct replacement for the two factory Torx #20 hold-down screws (999 073 143 09). The kit also includes two new nuts (999 500 092 00). Your feedback is always appreciated


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Flagman, my problem has been with the female end spinning while turning the male end. So it can be very difficult to loosen this fastener (in stock configuration). Does your product solve that problem?

Does anyone have any suggestions on how to solve or alleviate that problem?


Edited by b-man
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Hi b-man,

Thank you for the response and feedback. That's definitely a problem. I've experienced it on my 03 car numerous times. With knurled screw set, you can use your thumb and forefinger to pull up and tighten at the same time. This puts enough pressure on the rubber nut to keep it in place. With the factory Torx screws, you can't do this. So the rubber nut spins in place. I hope this answers your question.

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  • 1 month later...

Hi Loren,

The cowl panel(s) hold-down Thumb Screw Kit is complete and for sale. The kit includes: Two CNC/CAD CAM designed black anodized knurled aluminum thumb screws and two rubber nuts. The kit sells for $21.95 plus $4.35 for USPS Priority Mail. For each kit sold, $5.00 will be contributed to the Renntech Board. We accept PayPal, Visa, MC, Checks, and Money Orders.

Best Regards,



GMP Parts Company

111 Quaking Aspen Way

PO Box 5257

Etna, Wyoming 83118


Email & PayPal Info.: johnnyflagg@gmail.com

You can order it here

Edited by Loren
Updated address
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  • 6 years later...
  • 9 months later...

I for one would like to hope that there is a superior solution to preventing the well nut from twisting in place whilst fastening the knurled thumb screw.

Perhaps some sort of adhesive, or possibly a more permanent nut affixed using gas tungsten arc welding.

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In my experience even without trying to over-tighten the well nuts tend to rotate on thier own, regardless of how much pressure is applied.

I actually liked the idea so much I bought a set for my battery cover and have the same problem there.

IMHO the problem is actually the flawed decision to use a well nut instead of something that is fixed to the body.

I know I drummed up an old thread here but have been in this area of the car more than it's fair share in the past few months.

Leading to a little frustration.

Perhaps a visit to the friend with a TIG welder is in order.

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  • 4 years later...

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