Really not a difficult do it your self thing, I would under size drill through the pins , Then very gently drift the pins out using light taps with a small ball peen hammer as the handle was supported on a vice with the jaws open just enough for the pins too pass through, Or get a 3/4 in. board and Drill a 1/2 in hole in it too supprt the handle fully (better than a vice) ( go very slow and easy with light taps, and use a good drift the size of the pins or slightly under size ) once the pins are off the scales will remove rather easy, If the scales we previoucly glued take a hair dryer and gently heat the scales they should then come off ( DO NOT ATTEMPT TO PRY THEM OFF) clean the area where the scales go with steel wool, clean the backs of the scales and check for flatness of the scales bye laying them on a flat table with the side down that goes next too the handle where they came off, if the horn is not flat tale a piece of fine sand paper lay it on the table lay the scale on the sand paper and very gently push back and forth till flat go slow and do not remove too much horn just enough to make it flat. Once that is done get some brass rod the size of the pin holes that is a snug fit, and a piece of brass tubing for the lanyard hole ( most hobby stores will carry the rod stock and tubing, take the knife along too check the size you will need) (not tight, you should be able too push the rod in the holes with your fingers ( Cut the rod just about flush with the scales polish the ends of the cut pins keeping them square. You can now apply a very light coating good epoxy too side of the scales place the scales on the handle and insert the pins, clamp the scales tightly and wait on the epoxy too fully dry. ( rubber bands or surgical tubing works well for the clamp just be sure no glue has spread out or the clamp will be glued also, but no fear if this happens gently scrape the stuck rubber and gently polish the area )Now comes the hard part gently peen the pins (be very careful with this as the horn scales seem too have some age on them and could crack) Once the pins are tight lightly buff them, (use a dremel tool better control as you only want too polish the ends of the pins smooth and not the horn) All done, go slow and and do not force anything you should be fine. Best part you done it and adds too the history of the knife,