[MJRW]

for my 637? I would rather have a round one as opposed to a spur but I still want a hammer.

[Nick96]

Don't know of any after market button hammers for these things. I've heard of people sawing off and rounding the spur though. Another option is a hammer shroud (like the S&W Bodyguard). Search the web for hammer shrouds or Waller & Sons. This would likely be a more satisfactory solution than lopping the spur off (provided you could find a reputable gunsmith to do it).