Delivered trimmer head is different as is the original part Honda UMK435E. Received trimming head has differet the holding hole which is smaller than original Honda UMK435E and in addition hole is other way shaped. This difference generate the axially clearance between gearbox and trimmer head 6.7mm!! But I had want to use delivered trimmer head. For that I had must to use one home made pad thickness 6.7 milimeters. Now I can using my trimmer HONDA UMK435E with delivered new trimmer head, and it works good ...