On the saw I gave a friend, I swapped the screw for a thumb screw from my significant collection of bought and captured thumb screws saved for jigs. Plan on the same for mine, but have no more M4's among the fifty ones I have and it's an hour to the civilized world.
As I posted elsewhere, it looks like the difference between the QuickClamp and the stock one is, the screw of the stock one acts as a back for the blade, where the QuickClamp pinches the blade. As such, there is no reason a swamp to 3/4" M4 shouldn't do the same job.
I just posted about the radiator keys because of the difficulty in locating clock keys and such that work for those on a budget, which many are, if only because they have to chose between a light and a key or something else. Looking at bring this saw up to my specs, it's real easy to see buying storage tubs, a work light, key, and what have you can add up quick, and cost me that other toy, uh, tool I wanted.
Did I mention proprietary approaches to simple things that complicate things annoys me?