Ahh yes I see clearly. In flight they won't be touching the base plate anyway, so they are free to drop down a hair or flex up a hair depending on thier individual needs, however at no time should they droop or slap any lower than when in contact with the base plate. Like you said, in a bumpy landing. Should help to prevent the blades from ever striking the tail as well?

It's beginning to look like a piece of cake now. I have the fuselage with engine and radio, and a source for a rotor plate and blades. All I need is to attach a pylon and come up with some kind of actual bearing device to mount the plate to. I guess it would be wise to consider that part before building on the pylon. I have noticed some are using R/C car parts.

I just now drew this up. I have unlimited access to a metal lathe, so whipping something like this up out of aluminum shouldn't be hard.