Listen hhnngg 1, I have been using KMC Missing Links on both my road bike and mountain bike for a long time. You do need the pliers to un-install, but installing does not need all that weight you mentioned. I have never ever applied weight of any kind.

What to do is make yourself a little tool from a wire coathanger for installation. Cut a piece that is sufficient from a coat hanger, make it into a big V, then bend in the two top of the V in a little bit. The top of the V on both sides hook into the chain. This tool is used to make a slack in the chain, then work real easy to put the Missing Link in position. That's it. No weight necessary.