I spent some time researching some old threads and gave up, I'm sure plenty of you all know but I don't, the older style hard handled drivers I suppose are no longer offered in anything longer than 8"...they were offered in up to 24" (SSDMR24) what other sizes were available in between 8"&24". The newest comfort grip type have interchangeable shanks...were the older style able to be changed in the same handle? Any help with part availability, interchangeability or advice would be appreciated. Thanks