The original studs that the exensions screw onto are not evenly loaded by them. The way the extensions are locked into the spacer that is trying to prevent them unthreading results in them being unevenly tightened. In theory you can nip them all up to the correct torque then measure how far around each needs to turn to bring them in line, drift the studs back out and turn them in their splines the correct amount. In practice it will never be possible to get them all properly tightened to the correct preload and in line enough to lock into the spacer properly. Also any flex in the fitment will be magnified by the spacer extension and have a greater effect on the extension thread than it would on the wheelnut thread causing it to loosen, made worse by the uneven loading.
In short, the original wheel studs can snap.
YIKES. will have to give this much thought indeed. Many thanks
