Wheel Spacer Concerns

[techsan]

I recently did a 5 lug conversion on my 88 LX convt. and bought grey bullit rims (17X8). On the front I used the 5 lug rotors out of the ford racing catalog that uses the stock style hub (attached to the rotor). The main problem I faced was that the backspacing on the new rim was 0.850 in. off. I talked to a local shop and they told me they could get some wheel adapters that bolt onto the rotor, and have 5 seperate lugs that the wheel bolts onto. That souded pretty safe, however; he is taking forever to get the things to me. I got pissed and bought some cheap wheel spacers at some accessories shop in the hood, used some longer studs on the rotors and was able to screw the tires on. Currently the lugnuts are fully threaded onto the stud, but the end of the nut is flush with the end of the stud. Many people have told me this type of spacer is dangerous, but i can't see why. Has anyone heard a logical reason for the danger other than a nut that is not fully threaded? Any info on this situation would be greatly appreciated.