Originally Posted by maleek 
For those who live in countries where the Pentax Screwmount Lens Adapter might be out of stock. A word for the wise, some of the third-party adapters may not work as good as the original. At least the one I ordered from Ebay. Lenses will not be able to reach infinity focus, and will not be able to reach the intended focus lenghts.
I just ordered a new one from B&H Photo Video in New York. $15 and Pentax brand. It should fit flush and work reliably. I made the mistake of ordering one from Hong Kong through ebay, and it would not focus to infinity.