koken wobble-fix extensions... one extension to rule them all? maybe not.
hoping to replace all the random no-name **** i already have, i bought the full set of them in 3/8" and three sizes of them in 1/4" (50, 100, and 150mm) thinking they'd be my only extensions.
the catalog says they're not as strong as normal extensions, but i decided that i'd start worrying about that if i ever broke one.
build quality is very nice. i love the finish and knurling.
the wobble feature works as advertised, but note that sockets aren't held firmly. unlike on a universal joint, the socket just kind of flops around on the extension when it's in wobble mode.
what i was not expecting, however, is that the compatibility isn't perfect with all kinds of socketry. particularly with zeal stuff where they've trimmed the fat.
the anvil is longer than normal. there's a square portion below the tapered part that needs to be pushed in for it to be fully engaged (not in wobble mode).
i show this here with a red line indicating the point of full insertion:
what are the consequences? unfortunately, i don't have all of my socket stuff here with me rn to test.
but on standard (more like short) zeal 1/4" sockets, it extends into the socket (somthing like a normal extension shown on left, wobble-fix fully inserted shown on right):
this gives less depth to engage a fastener. does it make a difference on this already-short socket? maybe. dunno yet.
on sockets that have obstructions like this smaller 1/4" socket on the right where the square drive isn't broached all the way through, you can't actually lock it in all the way. you can only use it in wobble mode:
so i guess that these wobble-fix extensions are still usable at least in wobble mode with everything i've tried so far, but full insertion is not possible or reliable with some sockets. might want to re-think these as your main set of extensions if you have a lot of zeal stuff.
maybe i'll eventually buy more extensions (either in zeal or just normal koken), maybe not.