Budgie, I am the inventor but, untill these 'new spec' blue ones, I had no ability to influence what materials or the fit and finish of the connectors
The very early ones ones had, unfortunately, a part fitted inside that was causing this seizing problem. Also the indentations were to large causing play and one also due to this they could break through from one indentation to the next. The blue 'Proligic' ones have the correct size of indentation and upgraded assembly parts overcoming both these problems.
Budgie, although all this was out of my control please accept my personnal apologies and you will find the new ones are 'a completely different kettle of fish'.
Small connectors have been designed for non-load bearing items, specifically bite alarms, Medium (original size) for all general use for all coarse accessories and the Large for the bigger handles/bigger banksticks and some prefer the Large on their keepnets.
You can see these clearly on my www.cleverclaw.com site
Best fishes
Nick Palmer