There are at least two solutions to the exposed tip problem. 1: Put a Selector blade in your 186. These are offered all the time on eBay, and they come in many shapes. 2: Grind down the foot on your present blade so that the blade can go deeper into the handle. This is a trial and error procedure, so go slow at first. Buck should be able to drop a 420J blade in your knife for a modest fee. The number on the blade will not be correct, but it's a user.