I bought one from Steve on eBay, and ended up talking to his wife as i gave her my credit card info -- just a real pleasant lady. His tool arrived in only a couple days, and I went right to work -- it's milled (probably CNC) to just right tolerances; correct sizes for milled sight at one end, stamped sight at the other. Since it is the same width as the sight when inserted, the hole for the pin punch automatically lines up, and a firm smack with the hammer sends the pin right out.
I also had great luck with a tip I got on a classic car restoration chat list: A penetrating solvent for loosening old corroded fasteners that is much better than Liquid Wrench, Nok-R-Loose or WD-40 can be easily made with a 50-50 mixture of acetone and automatic transmission fluid. The club ran some semi- scientific tests and found that the breakaway torque required on a test panel of identical rusted-in bolts was as much as 25% less than the commercial penetrating oils after equal immersion time in this new solution.
The combination of Steve's new little tool and this penetrating oil has made removal of the sight pin a one-strike job four times in a row!