Checking in here as well. To tighten up the flop, do you simply peen the rod going thru the fork?
Sometimes that does the trick, and also squeezing the two forks back together may also work, but that only will last so long until the head is loose once again. A second alternative you could try if the flop is excessive enough, but sometimes wrapping a thin string (believe it or not) or flexible wire around the retention pin in the opening between the head and fork joint to fill in the gap, can solve the floppy head issue, given it's wrapped around the pin enough times. But the correct way to fix the problem is to knock out the head retention pin and spread out the lock washer with a couple sets of pliers, so it puts good tight pressure between the head and fork once again. Reinstall the washer and the head pin and your good to go again. Sometimes it can be very difficult to knock out the head pin, especially with S-O made flex joints. I actually made my own setup where I took one half of a vice jaw insert, drilled out a hole (slighly larger than the pin diameter) to act as the pin removal area. Aided with a small amount of penetrating oil spray on the joint, then I use a pushing/driving plug on the opposite side to push the pin through the head and out the fork on the opposite side. As the vice is tightened the pin goes into the hole I drilled on the jaw insert, allowing the pin to be easily removed with even hitting the ground. I came up with this idea as an alternative to hitting/punching the pin out with a punch, which can damage things too easily allot of times (mostly my hands, lol). So far I have used this removal jig on three S-O flex heads to remove their head pins, and it has worked beautifully every time. Not much beats the clamping/pushing pressure of a vice, and most of us common handy folk, don't have a hydraulic press handy to use, haha. We have to im'pro'vise... and MacGyver it.

-JS