I can't see it through the hole and my phillips screwdriver didn't feel like it was catching

It's a torx, t-10, t-15 or something close to that.

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2000 C230 Kompressor "Frosty"

2007 PT Cruiser
2001 VW TDI Beetle
1999 Landrover Discovery II
1971 Corvette

Gone: 97 Cabrio, 83 240D, 93 VW Eurovan, 95 Volvo 850, 93 Chevy Astro Van, 77 VW Bus, 99 VW Jetta, 74 VW Bus

Torx. I forget the size as well! Note that you might need a long torx bit - I had trouble using my really short ones when trying to pull a steering wheel off a junkyard car. So I ended up abandoning that effort.

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'82 300TD
'77 6.9
'75 280S
'74 280
'87 Porsche 944 turbo

You need a 2" long torx T30!

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Thanks again!