Good info & I may very have had one of their slightly undersize ones (I didn't retrieve a # or take a pic like I should of) but it did about fall into the bore. Now that you mention it I did try a 1&41/64 & it was a tight fit just setting it up to the bore & I was worried that I might crack something if I drove it in & it was steel & haveing always used steel & everyone touting brass I decided to go with brass (at least on the 2 rear hidden ones). I certainly was not expecting the amt of difficulty I had on this simple issue.