CSOB thwarted again, 3-piece rim tire mounting fail, A6 was no problem, A7 fighting back Options

[mskala]

So, for my Fuchs centered BBS race wheels, 7.5x16, I finally have the need to put
on the Hoosier A7. (My tires last a long time since I don't do too many events per
year).

A while back, I got sick of tire places that charge $75 or more to mount up the stuff
that they don't sell. I told them if they would sell Hoosier I would buy it there.

So when I had the A6, I just took apart the wheels and assembled on the tires. Don't
need good balancing for low speeds at autocross so I can do that on a bubble.

The A7 in the same 205/45/16 size looks identical in dimensions, but the damn things
will not seat the last part of one of the beads. I'm not going above 40psi. I used a
rubber mallet for a while, I put one on the car to shake it, then I went up and down
the driveway a few times, then a few hundred yards down the street slowing going
side to side. No dice.

Now I have 2 like this and the other 2 I haven't tried at all. Any special way to make
this work or do I have to crawl back to the bastards with the machinery?

Thanks