Looking into it I realized that I would only really need to plug one or two of the extra mounting wholes on my castle motors. Mikes mounts cover most of them, that and the traxxas mount covers all of them on the 4x4. The ten t has the best coverage with the newer style motor mount. The Raze-E has one obviously exposed, but it is in a place where I can just stick a short button head screw in it and probably call it a day.
Which in you case Freeze seeing as HPI uses the floating mount you could have probably just used short button head screws instead of the grubs. That way you can stick with the blue loctite and not have to lose the mounting holes if you plan to use the motor in another application.