I've seen this question asked a gazllion times, and I found the perfect tool at Poop Boys to remove the 4 inverse torx screws that hold the rotor cap to the assembly. Cost about $1.20....

just put 2 screws on the torx bit and lock them together and BLAM!

Here's a pic of the part number:

 

A screw is hardly the perfect tool. The same store can order you an actual tool for the job. Can't remember if it's an E-4 or E-5 but it's in the archives.

 

It's an E4 (long)...picked mine up off the Snap-On truck 2 years ago for $15 and it's easily paid for itself 4x. Used it today to take it apart & get the dreaded moisture out & got rid of the miss.

 

it's the perfect tool....trust me!

 

Good idea!

Rob

 

I think the Lisle E-4 is about $4-5

 

Especially when you have everything ripped apart and don't have time to make a run to the store to get the tool.

 

Even better yet- just pop one of the torx screws out of the throttle body cover plate- same size as the inverse torx on the opti

-Mark

 

And rip up that screw and then discover that it can't be bought separately from GM.

 

 

Steve, lighten up dude. There is no "play" between the hub bolt I described and the Opti screws, it fits likes OJ's glove(ie tight!)....so no chance of strippin the Opti screws; also, the 4 inverse torx Opti screws do not require excessive Torque, only use enough torque for seating the rotor and to compress the rubber seal between the rotor cap and the aluminum Opti housing.....

I am trying to help people out with easy alternative methods, as it is not easy to find the "proper" tool you have eluded to.