I have been looking at the Porter Cable 4212 dovetail jig. I got a chance to get one from a gentleman who wants to sell it. He said he used it twice and put it back in the box. He wants a $100 for it. I would really like to have it but he said he lost the bit and doesn't know where to get one. He says only Porter Cable bit will work with unit. I find that hard to believe. It calls for a 17/32" by 7 deg. Is this a specialized bit? I guess I won't buy it if they are that hard to come by. Thanks.