automatic tire balancing ?

[amalventano at sc.rr.com (Allyn)]

ok, i've done some research on automatic-type wheel balancing solutions, as
the rieger wheels have this funky issue with a slightly off-center hub hole
(.5mm), causing the wheel to sit differently on the balancer as compared to
when it is mounted on the car. this results in a wheel that seems to always
be out of balance, as its impossible to correctly compensate for the offset
issue while balancing it.

a quick calculation yields that .5mm off-center will cause nearly half an
ounce of equivalent imbalance on the rieger wheels (due to their weight).

i have found the following possible fixes:

http://www.balancemasters.com/index.html
this is a liquid (mercury) filled ring that attaches to the wheel. only made
for motorcycles and trucks though.
http://www.balancemasters.com/howtheywork.html
more info about it.

http://www.centramatic.com/index.html
basically the same as the balancemaster, but this one uses fluid and steel
balls to do the balancing. also seems truck-specific, but they do custom
applications as well. nothing promising for us though.
http://www.centramatic.com/Demo/demo.html
this is a kick ass video, showing exactly how it works.

http://www.taabs-int.com/frame.htm
one more ball-bearing type balancer.

now for the more promising stuff:

http://www.imiproducts.com/
"equal", plastic sand-like polymer that goes straight into the tire itself.
intended for trucks, but nothing would prevent this from working in
passenger car tires.
http://www.imiproducts.com/imi_htmlcode/imi_frame/imi_fs_news.html
get a basic idea of how it works. (not as good as the centramatic video).

downside to this is special hardware ($$) is needed for installation via the
valve stem.

http://www.tirelife.com/
this stuff is a liquid thats meant to seal tires/wheels and prevent
corrosion. also seems truck oriented, but safe on all types of tires. this
stuff isnt really meant/intended for balancing, but i would imagine it would
work just like the equal stuff would, so long as it stays in the liquid form
(not too sure about this one though). i would imagine a
larger-than-recommended dose of the liquid would be required to have the
proper counter-balance effect, though.

my current intention is to email the tirelife people and see if their
product stays liquid, and possibly use it.
any inputs/experiences/feedback is appreciated.
Al