I am in the process of repairing one right now and had to source a driver which will do the job, and do it very well. I have a few spares and am happy to send you one if you happen to need one and wish to quit tearing up your rare and hard to find jets: $21 to your door in Continental US
Please EMAIL ME...don't PM or respond to this ad, as I only have a couple and would hate to miss seeing your reply
Attached to a 1/4" drive handle which you likely already have, it makes for a nice addition to your repair kit. Here you can see it, in relation to the Jet "square" that it drives...