The nearest thing I have to hand for a comparison, is the Wenger can opener and Vic Pruner blade (which fits in the same can opener slot). The tang on the pruner blade protrudes further from the pivot hole than the Wenger can opener, so the backspring might feel a bit soft. Also the kick on the Wenger can opener sits a lot lower, which might mean the Wenger can opener sits high in the closed position. No 91mm backspring to hand to run a test on though