[MultipleParadox]

For the time being I found a plastic screw that was just big enough to screw securely in the grip and still have enough contact on the frame to provide good torque

So I just put this and added some "crazy glue" (not exactly this, safe for plastic) to lock it in there

It feels very solid as it is

We'll see what time will tell

Thanks guys

Édit: plastic screw being a brass screw with threads for plastic :P