Hi John, the 1/8" was a minor problem when I would stack 5 or more pucks in a row. So every 2 or 3 pucks I'll use either a bisquette or 5/8" slice from a standard 2" copper cap which has an OD of 2 1/4". As far as filling the pucks, I don't have a source for chips, but have pulverized pellets and used either crumbs or pieces of BS bisquettes. The latter burn well in both cold and hot smoking conditions. The pieces of pellet will only work well in 180-210* oven temps. What I haven't tried yet is priming the generator ramp with three slices(rings)from the standard cap and filling them with pellets which would come in direct contact with the generators heating element. My original intent was just to make an inexpensive pair of metal blanks which would allow for complete burning of the last two bisquettes.The project has obviously become a work in progress and since the costs of materials, necessary tools( a tube cutter or hacksaw),and fabrication time are minimal, lends itself to relatively easy experimentation.
Hope that helps-Tom-