Does your Harry’s blade fall off after a few uses? It’s very irritating that the blade falls off the handle in the middle of shaving. It might lead you to believe this is intentional: to force you to change the blade more often!
Luckily there’s an easy fix. In the photo below the red arrow points to an indention in the handle and the yellow arrow shows the little tab on the blade that’s supposed to lock into the that place in the handle.
Using any pointed tool (small screwdriver, scissors, nail file, etc.) press down VERY hard on that tab until it gives and bends. Now slide the blade onto the handle and hear it click! It won’t fall off as easy. You may have to do this every few days depending on how long you use the blade.