OK 911 Gurus;

I am restoring my beloved '72, and have sent out, and got back a whole new overhauled harness from the guy in Europe.
It came out pretty good, but now I need to reinstall the rubber sockets that take the round electrical relays near the fuse boxes.
Is there a magic tool that makes this easy? I tried something pointed, and then something round and flat, but cannot get the pointed rubber end to drop (snap?) in to the metal holder, and I am afraid I am going to break them.

Any suggestions ??

Thanks,

Stu