I guess this is the stand that you are talking about?
http://www.harborfreight.com/cpi/cta...emnumber=99701
Here are some 8mm spools and 10mm spools.
http://www.harborfreight.com/cpi/cta...emnumber=66925
http://www.harborfreight.com/cpi/cta...emnumber=66926
What is the 8 and 10mm reference? Bolt size? I may look into getting those for my arm. I figure all I can do is to drill and tap the rear arm and maybe use some blue locktite. ???