Contact Dan at www.accu-tig.com
He'll give you some basic instructions to make a measurement with a feeler gage before you send him your bolt. Have him install a Holland Tac Handle. It is a tad longer (like you asked for) and hasn't the big knob like these thread on knobs do. It's shaped kinda' like a Rem handle, but longer. When you get it back, you'll not only have a nicer/better handle that's tig welded on (instead of silver soldered), and, the extraction timing
will be correct. All in all, the cost including Priority Mail is about $85.. Money well spent! You've killed two birds with one stone,,,, a better handle and positive extraction. I've seen way too many of those big knobs, that are threaded on, be 'finger wackers' that hurt every time ya' squeeze one off.