What tonearms are compatible with a Scoutmaster?

AudioFeil is quite right, the table and arm are critical. I have just become a VPI dealer again after a long lapse so I don't know the new line as well as I did the old. On the Scoutmaster you are limited to VPI arms to the best of my knowledge as they do not have the removable arm board of the Aries. I believe that the 10.5 will fit but not the 12.7 which requires much more room. I cannot agree with Jaiello about the Scoutmaster being slow, it is the fastest table I have used. Being used to the older VPIs , HW 19s and earlier TNTs, I was amazed at how different the Scoutmaster sounds. I suspect that the Aries sounds more like the earlier models. The 9 on the Scoutmaster definitely sounds faster than my SME iv or 309 did on the TNT or my Basis Ovation. I think the Scoutmaster is capable of a very high standard of performance but like all turntables takes considerable effort to get their best sound. I have just become a dealer for the Star Sound platforms and points and have been amazed at the improvement in this area made during my sabbatical from audio. I am sure that there are other devices that give good results, I mention Star because I have used them. If you are not using a good isolation device I would start there.