I have had this flash for about a year now and use it regularly - no problems.
After careful consideration of the mechanism and MANY posts I make the following points.
- The pin is pushed home into the camera socket hole by a small internal spring in the flash shoe.
- It is withdrawn from the camera socket hole by a long ramp on the top of the locking ring.
- If the shoe is not full pushed to the front of the camera socket or is twisted then it is possible to lock (jam) the pin somewhat.
- As there is no "feel" due to the big mechanical advantage of the ramp the lifter pin just goes up whether or not the locking pin is jammed. This breaks the small plastic link between the pin lifted by the ramp and the locking pin.
- The only way to remove the flash then is to use a long shafted fine Phillips head driver to unscrew the foot from the flash and to delve in the foot internals to lift the pin.
As I fear I may, due to rushing, forget to seat the shoe properly when I remove the flash from the camera I may end up with a jam, I have filled the socket hole in the camera shoe with a short cylindrical piece of wood made by carving down a cocktail toothpick tip. I have done it this way, so that if I find that my flash tends to work loose when only only using the shoe friction and the clamping ring pressure for retention, I can easily revert to the designed locking system by picking out the wood with a needle.
Rod