It sounds like you might have used button head cap screws if they took a 2.5mm allen wrench? I picked up a couple of M4x8 12.9 grade cap screws from Home Depot and they use a 3mm allen wrench. Google Gemini said 3mm was standard but some button head might use 2.5. The cap screws don't have quite as much shoulder area as the slotted screws, but I do think they maybe easier to install.NCGermerican wrote: Sun Jul 12, 2026 9:02 pm I have no idea why the engineers decided to use slotted screws. I replaced them with 2.5mm allen screws. Made it MUCH easier to reinstall and will be easier to remove again in the future (in 30 years or so.....).
It's not fun, but you'll get it out.
Kroon Harness for 944 Turbo
- Latitude48
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- 1989 944 Turbo - Guards Red/Linen
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- 2003 Audi 1.8TQ - Denim Blue/Black
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- 1989 944 Turbo - Guards Red/Linen
- 1990 944 S2 - Guards Red/Black
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Yes that's correct - they use a 2.5mm allen wrench - the screws themselves are M4. I wasn't super clear on my post. 2.5MM should be fine as they are barely torqued at all. Basically finger tight+1 even from the factory.Latitude48 wrote: Tue Jul 14, 2026 10:12 amIt sounds like you might have used button head cap screws if they took a 2.5mm allen wrench? I picked up a couple of M4x8 12.9 grade cap screws from Home Depot and they use a 3mm allen wrench. Google Gemini said 3mm was standard but some button head might use 2.5. The cap screws don't have quite as much shoulder area as the slotted screws, but I do think they maybe easier to install.NCGermerican wrote: Sun Jul 12, 2026 9:02 pm I have no idea why the engineers decided to use slotted screws. I replaced them with 2.5mm allen screws. Made it MUCH easier to reinstall and will be easier to remove again in the future (in 30 years or so.....).
It's not fun, but you'll get it out.
1987 951 - Nautic Blue over Linen
2013 Cayenne GTS Black (Daily)
2023 Durango R/T AWD - Destroyer Grey (Wife's Daily)
2013 Audi A5 Quattro - Brilliant Black (Son's daily)
1987 944 S - Nautic Blue over Linen - sold August 2024
2013 Cayenne GTS Black (Daily)
2023 Durango R/T AWD - Destroyer Grey (Wife's Daily)
2013 Audi A5 Quattro - Brilliant Black (Son's daily)
1987 944 S - Nautic Blue over Linen - sold August 2024
