You beat me to it Jonathan!!
I just Edited my Post in the 'Show Us Your Losi 22 Conversions' Section, regarding no use for the TLR Brass Rear Weight Kit on the AC Tardis 22!
HERE IT IS :
"By the way, just out of Intrest, I had my Tardis 22 Mounted on 4 Scales the other week, to Compare against a Standard Losi 22 in Mid-Motor Configuration - surprisingly, even against a fully Weighted up Losi 22, inc the TLR Brass Rear Weight Kit, according to the Scales, the Tardis 22 had 50g extra Weight pushing down on each of the Rear Wheels!!
.........& thats without even running the TLR Brass Rear Weight Kit!
"