Hi John,
this probe doesn't have a 6mm shankand the threads for adapters is quite small. Most of the extensions are about 3mm in diam and the threads are not close to being the same diam of the shank. Now you might be able to find a 6mm or 1/4" ruby tip that will work, assuming a tip will do the job for you. I can look to see if I can find one.
Mike