Since we are getting quite a few new Sako shooters signing up, I thought it might be a good time for a post on how not to mess up the traditional style Sako scope rings. I have seen many, many of these rings messed up with burred screw heads and thumb nuts. This is almost always the result of using the wrong tools. First, the slotted screws holding the rings together. The key here is always to use a snugly fitting screwdriver with a parallel-ground blade. The drivers you get at the hardware store are almost always taper ground. A tapered blade will not fit snugly into the slot and sooner or later will slip, resulting in an ugly burr on the screw head. There are two kinds of gunsmith screwdrivers with parallel-ground blades - the one-piece type such as made by Grace, and a handle with interchangeable blades, the most popular of which is sold by Brownells. If you use the Brownells set, the correct blade for Sako ring screws is #210-3. For the large thumb nuts that hold the rings to the bases, the correct tool is a Weaver type driver. As with the screwdrivers, you can get either a one-piece tool or a tip for your magnetic handle. The small tool shown in the photo below was made by B-Square. I keep it in my range bag. The bit shown on a Brownells handle also came from Brownells. Most people try to tighten these with an ordinary screwdriver, which frequently results in a damaged slot when the driver slips. It is critically important for both the ring screws and the mounting nuts to press the driver into the slot all the way, and dead square to the screw. If the driver is at an off angle, it will slip. Reproduction ring screws are available from a custom shop in Montana for 30 bucks for a set of eight. At that price, it pays to be careful with the originals. Good luck finding spare thumb nuts - once in a while you'll find some in a batch of parts, but not often. The ring screws are M3.5 cheese head. Do NOT use the screws labeled by some sellers as "For Ruger or Sako." They will fit - sort of - but they are a US thread and do not fit properly. I have seen several sets of Sako rings that people have used these screws. The fit is sloppy and the screw threads are shiny from metal coming off as the screw rethreads itself. Fortunately, the screws are made of softer metal than Sako rings, so they don't typically damage the rings. From top: B-Square Weaver scope ring tool; Brownells handle with Brownells Weaver scope nut bit; Brownells handle with 210-3 bit; Grace screwdriver that fits Sako ring screws. Note the stepped tip on the Grace driver. This photo shows the two types of parallel-ground screwdriver tips. The top one is a hollow grind that is flat and parallel at the tip. The lower blade, from a Grace screwdriver, has a stepped tip. To put everything in one convenient post, I've added below another tool that I made for the windage nut on the other side of the Sako ring. I made it out of a gunsmith's shorty screwdriver, probably a cheap clone of a Grace driver. I did the work with a Dremel tool and a couple of Swiss files. It works fine. You need to be sure that the blade fits the slot and the center opening is wide enough to clear the stud on the ring. See pictures below; I've posted a slightly more complete explanation at the bottom of this thread.