Yes I believe I am reading you right and adding a pin to ones that are not, is easy. This fix was not to critisize other designs it was out of my own nesecity. And when presented to Kevin he saw the benifit and incorperated it into his. Now when I use the twinjector like I said I just fill and shoot then I push out the rest back in the pyrex with a swift push without the fear that the tips will fall off. For the people that dont like the lock idea, dont lock it but for the ones that see the benifit it is a real simple fix. Jacobs baits saw the benifit and incorperated it in his also. Frank