On 01/25/2014 07:30 PM, Daniel V. Mackey wrote:
  Ok, which disk would I purchase then? 
I'd first check with Accurite, but 208-40 seems to be a fair match.  The
1541 is SS, 48 tpi, IIRC.  The 1571 is double-sided.
It helps if your 'scope has a fairly long persistence phosphor, or is a
DSO or you have been skimping on your vitamin A.  300 RPM is only 5
revolutions per second, after all.
--Chuck