This was the response from a Caswell rep:
"If you're not removing burr marks etc, then I'd start with a walnut shell media. See http://www.caswellplating.com/buffin...shell-5lb.html
You should be able to get a mirror finish using this (may take several days). As with any polishing, metal is being removed, so if thread tolerance is critical, they must be protected."
This was the response from a Kramer rep:
"...Here are two options for polishing the stainless parts:
Option 1 (wet process)
Stainless Steel Jewelry Mix and Kramco 910 Burnishing compound. This media should provide a very high polish on the parts but may also get into the holes and possibly get stuck. Cycle times are likely to be in the 2-4 hour range.
Option 2 (dry process)
Fine Walnut Shell Grit and Metaglos Polishing compound. This will be a longer cycle time (24+ hours) but may come close to the near-mirror finish you noted. The parts will need to be cleaned after tumbling as some of the compound will probably get stuck in the holes, etc.
Of course, it is difficult to understand exactly what the part looks like or what surface is prior to tumbling just from a description. In addition, it would not be unreasonable to use the two options above as a two-step process. "
these are the links to those products:
KramerDepot Walnut Shell
Metal and Plastic Polishing Creams for Dry Tumbling
KramerDepot Finishing Creams
Does anyone know of a cheaper alternative to the Metaglos Polishing cream/compound/stuff linked above?