If you have any problems obtaining stainless steel BB’s, then go to your local hardware store and buy some boxes of small stainless screws, which will work very well (or order it online).
Grit-blasting and tumble-deburring are two very effective methods by which metallic surfaces can be prepared for brazing, to remove surface oxides, and also to deburr part-edges. Because of the softness of aluminum parts, and many copper parts, these procedures may not be common for either of those two soft metals. But for steel parts, stainless, super-alloys, etc., these procedures are excellent and commonly used.
As discussed in this article, be careful that any non-metallic blasting grit or tumble-deburring media are NOT used, since they can leave a non-brazeable residue on the surface of the parts. Instead use a stainless or nickel-alloy metallic grit when grit-blasting, and stainless spheres for tumbling.
Finally, remember that neither of these two processes is designed to remove oils and lubricants, which can only be done with effective degreasing solutions, prior to proceeding with any grit-blasting or tumble-deburr operations.
Next Month: we’ll look at Item#3 in Table 1, namely, some thoughts about proper fit-up and gap-clearances for brazed components.