Quick Center Link/Drag Link Questio - Missing Allen key?

[swheele2]

I am replacing the center link/drag link on my 1984 300D. I've done this before, but with other brand parts.

However, on the Lemforder center link I bought from Pelican Parts, there is no Allen/hex key on the end of the shaft, like there is on other brands.

How am I supposed to tighten the lock-nuts without holding the shafts in place with an Allen socket? Is there some trick I'm missing here?