Markd51, any results to report yet? I have the same situation: PT6 arm that came with an AQ 404B MC cart, but no cantilver/stylus. I have in place now a Ortofon OM 10 Super to tide me over while I decide whether to refurbish the AQ cart or go with one of Raul's gems (which are so hard to find within my budget!)
I considered the route you took with the damping fluid, but the cheapster in me went another direction. I purchased 50 wt. silicone shock oil from a hobby shop, $3.50 for about 4 oz. This stuff is actually designed for radio controlled cars and is rated for both on-road and off-road use,:-)! They had in in 30 to 100 weight. All that's left to do is try it...if it doesn't work the wallet damage is minimal to try other weights.
I considered the route you took with the damping fluid, but the cheapster in me went another direction. I purchased 50 wt. silicone shock oil from a hobby shop, $3.50 for about 4 oz. This stuff is actually designed for radio controlled cars and is rated for both on-road and off-road use,:-)! They had in in 30 to 100 weight. All that's left to do is try it...if it doesn't work the wallet damage is minimal to try other weights.