I second Lps2cd's recommendation. I had one made for my Michell Orbe SE. It was ready in about a week and for $110. I did some dimensioning and just give TAP plastics my specifications. The one Michell sells cost about the same, and according to a friend of mine who has one, it doesn't do squat. And you are right, it bangs into the arm all the time.
TT dustcover - ,HELP, HELP,HELP....
Recently, I saw a univeral dustcover somewhere on the net that went on the plater like a record BUT also was rolled in a kind of half tube to cover the tone arm ( clever AND reasonably priced ) I can't remember the site ,it may have been a Brit site or if not, possibly the cover was made in GB -just not too sure about this last part. I'm getting anxious since I just got a new TT and I have a very curious 4 y/o grandson. Ah,very clever those Brits -or whoever makes it. Help would be greatly appreciated.