I've been brushing the cylinders of my model 34 with a 30 caliber bore brush. It does wonders for about 18-24 shots, then I got to brush again. I also have a 5-screw K-22 that is pretty much a safe queen. I would love to do the cylinders on the 34, and maybe do the ones on the K frame. Guess I'll keep an eye on Brownell's website to see if they get more of those reamers in, then bite the bullet and send them $65+ (ouch) for a reamer.