These fish totally weedless using the weighted hooks having the hook slot on top, yet instantly allow the hook to bite when a fish hits. Keitech's Fat Swim Impact baits have the top hook slot and have been murder on large pike for a few years now so I decided to incorporate a top slot in these baits. 100% my preference.
The end injection allows a straight in fill that gets super nice color separation....having the plastic colors needing to turn the corner as with the side fill allows too much mixing for my likes. Again, 100% my preference.
Neither of these changes are needed if you're happy with you baits as the come from the original mold. I wanted more from the molds so I made the changes, simple as that.