In trying to drive in my new spark plug tube seals, I get the impression I'm not driving them in far enough. I can get them a little better than flush with the valve cover surface, but they don't seem to want to go any further than that. I wasn't paying too much attention when I pried the old ones out, but seems like they were pressed down all the way
There appears to be about a 1/8" gap between the seal and the surface below.
I don't have the SST described in the manual, but I do have a press tool that's about the right size. I've already smashed one seal trying to get it down any further.
Thoughts? Is that as far as they go?

I don't have the SST described in the manual, but I do have a press tool that's about the right size. I've already smashed one seal trying to get it down any further.
Thoughts? Is that as far as they go?