We went ahead and designed a way to not need a zip tie to keep boots on the Hemi Coil packs when moving them off of the valvecover. We designed a brass stud that we attatch a spring onto to make contact to the coil pack. In the past, builders were using zip ties to keep the boots from falling off, but the contact spring would still shoot out. Problem solved. $2 bucks per stud and spring., check it out !!