ORIGINAL: edoubleaz
They are called HOB-BITS and are available at most good hobby stores. They have 2-56, 00-72, 00-80, and 00-90 hex head, fillester head, and flat head screws in various length. All my tanks have several varieties. Usual cost is about $2 for 5 of each flavor, nut bolt, and screw. I cleaned out my stores collection of hex and recessed bolts over time.
Yes I did steal your idea for the cleaning rods.
Thanks for the hex head info, the cleaning rod was from the instructions that I downloaded for my PE parts, 37 pages and many of these mods can be be done from scratch, what is nice about the instructions is that it comes with the measurements to locate almost everything mounted to the hull. If you would like it PM me, I think there is one for the Tiger I.
Gary