Try Grainger Supply. http://www.grainger.com/Grainger/items/5PA56
I utilize the Bucket Bag, for a similar application.
Avg price about $41.80 US.
Specs:
Bucket Bag, Round, Length 12 In, Width 12 In, Height 15 In, Canvas, White, Rope Handle, Straight Wall Plastic Bottom.
Grainger Item # 5PA56...
What about heat-shrink materials? As long as hole clearance isn't a factor with regards to the diameter of the shank - this would also provide a thin barrier between any dissimilar metals providing added protection against corrosion.
