From what I've read, the genuine Pentax M42 to K mount adapters are much better than the cheaper alternatives. Unfortunately, they're not only expensive, but also hard to find. The PentaxUSA web site lists them for $30, but says they're out of stock and don't know when they'll get any more. One of the members of this forum just sold one on E-bay for $38 plus shipping, and KEH has a used one for $37, and charges $45 for a new one. Based on Chako's advice I went to
Camera-Craft, and found the genuine article there for $34.95 Canadian plus shipping which they estimated at $15. (Pretty ridiculous for an item which can't weigh more than a couple of ounces) They did say that they had them in stock, however, and that's the only place I've been able to find that did have. Since putting the Dremel to the tele-takumar I think I'll just stick with what I have for now. Hopefully by this point I've ground off all metal shavings from the Bower adapter, and won't mess up my camera's sensor. I will continue to install and remove the lens with the front of the camera pointed down, however.
CN