Could someone please advise me as to how to mount the PPS Module 13.2 to the Core 2 V1.1?

I have removed the base of the Core2, unplugged the internal battery then placed the PPS on to the Core2 Main PCB, but then I hit a problem the base of the Core2 does not fit the bottom of the PPS Module.

Am I missing something here?

What base is recommended?

I don't need back up battery, I just wish to get my nice new PPS Module working on my Core2 V1.1 without falling apart if I pick it up.

Regards
Paul