Those who have one will recognise a well documented problem that sometimes affects unloading live/unfired .22lr rounds. (for some reason not .17M2, I think due to nin waxy tapered rounds that dont touch the lands)
It comes down to the claw being designed for both small rimmed .22lr/.17M2 rounds AND slightly larger rimmed .22WMR/.17HMR rounds.
With the .22lr barrel the head of the claw interferes with the slot on the breech face and can restrict the depth that the claw can extend under the rim.
If the chamber is sticky, bullet touches the lands or round is slightly oversized/dirty it can be left in the chamber and the bolt just cycles ineffectively.
In all honesty it was never a problem with mine, I put it down to keeping chamber clean of wax and using less waxy rounds.
Then it started whilst lamping the other week using CCI segmented rounds. They arent too waxy but they do show some signs of a coating or corrosion that is obviously a bit sticky.
I had read about the claw modification but did a quick refresh and thought I would post a clearer picture of before and after and show how simple it really is.
2mins with a needle file or sand paper to remove some metal from the forward/inner most corner of the claw as shown.
It now cycles any old waxy, sticky rounds without issue. (does both case lengths just to confirm!)
The old profile of the claw viewed from the underside is shown (exaggerated) in red. You are smoothing off less than 1mm of material.