I have been in the process all afternoon installing a 1/2" spacer. I looks straight forward. I have a stud remover tool that I got from Sears. The one part that I was worried about was pulling the old studs out. That part went without a hitch. Old studs came out. Took Blue locktite & installed new studs. Installed o rings & went to reinstall lower. I have a bravo upper with a Imco 2" shortie lower. I could get the lower on except for about the last 1/2 or 3/4". After fighting trying to get the lower on for about 2 hrs I went to remove one stud to see if it would go thru the imco lower. It would not. I then tried to see if the stud would go thru the upper it would not. The studs have a thick middle sections and that will not go thru. I looked at drilling out both the upper and lower but do not have the correct size drill bit. I think it may be easier to go and get new studs. Anyone besides me had this problem?

Turbojack.
I have a couple of drives in the shop that have spacers.. the uppers slide on and off real easy. If your studs are too fat in the middle.. you may have #6 studs. They use a larger, unthreaded section, to locate the housings. They wont fit the stud remover from Snap on that is made for a 7/16" stud. Not that much larger, but still bigger than the regular studs. This may be your problem. I would check into using different studs, rather than drilling.

hope this helps
Dick

I decided to call the manufacture tomorrow about getting the correct studs.

Talked to Zeiger. They shipped with the studs for a 1" spacer instead of the 1/2" spacer. They are going to ship me the correct studs.