I changed mine in 2016 before a few days at Road Atlanta. I asked Rich Brooks about how they greased them and he said they just stuffed as much grease into them by hand as possible. I asked him if they ever considered using a grease needle and injecting all of the boots for the control arms, toe links, etc. He said they had never done it as they were worried about the boots developing a tear. I decided to try it on the replaceable toe link boots. After injecting grease into the boots I left the car on the lift for a few days until no more grease was coming out of the injection needle puncture then I wiped off any grease on the boot and cleaned the boot with heptane which is the solvent used in cleaning an inner tube or tire before patching. I also carefully cleaned the puncture itself with heptane and then placed one small drop of superglue over the puncture and left it fully cure for two or three days before taking the car off of the lift. After the three days at Road Atlanta the car went back up on the lift for oil change, brake service, etc. and when I checked the rear toe link boots they were full of grease, the drop of superglue had sealed the grease needle puncture and no grease leakage was apparent. This lead me to believe that all of the boots should be injected as they don't have much grease in them and we all know that currently ball joints are not replaceable and I don't want to replace my billet control arms. Consequently I performed the same procedure and injected every boot with synthetic grease and glued the puncture shut with super glue. After a year and a half and many more track days the boots are as good as new with no leakage of grease and obviously no tears in the boots. This was not a process to be hurried as all of the internal excess pressure from filling the boots must be relieved before cleaning and then gluing the puncture shut. Normally boots are just injected and left however my reason for gluing the puncture was to prevent a tear in a non replaceable boot such as in the control arms.