The important part of the IRWIN ones (might be the same as the Craftsman?) is that they are external, they grip the outside of the bolt head (the top/cylindrical part anyway), like a socket with an internal helix. Most of the extractors I've had/broken relied on a hole in the bolt.

I understand your pain somewhat, one of the reasons I've been dragging my feet on pulling a perfectly good M104 out of the '95 to do the swap. Murphy stalks me.

__________________

Gone to the dark side

- Jeff