hmmm...do they sell 1" thick mdf at Home Depot?...or Lowes? Let me give 'em a call tomorrow. If they do, give me $5 for gas, pay for the sheet of mdf (they may even sell smaller pieces), cover the paypal fee and shipping costs ($4.60 priority for under a lb.) and I'll cut you up a pair, man. How wide do you want 'em? If you want 'em to be perfect, give me exact inside and outside dimensions and I'll hook you up....and if neither Lowes or Home Depot sells 1" thick mdf, will four 1/2" rings work?
-Jose