Originally Posted By: Doverham
I thought the telltale indicator of the screw grip was a horseshoe "collar" surrounding the top lever where it connects to the spindle.


I agree with Doverham & in the first photo it looks to me like the Harksom has it but the horseshoe shape is on the top lever rather than on the spindle boss. The engagement with the rib extension is same (i.e. the boss on the top of the spindle is what engages the rib extension, not the top lever it's self which is found on some non screw grip guns using a rib extension & 3rd bite).


Last edited by Brittany Man; 02/24/15 12:58 AM.