@ jbmonkey - thats a simple fix for the side to side play that is, take a coke can and cut it up, and slide a piece on each side of the blade (no washers so no worries) then wrap it in cloth or leather and put it in a vise and squeeze slowly, this will tighten up the pin and the aluminum spacers should help keep it from over tightening, but take your time when your on the vise. or instead of a vise use a tack hammer, basically how they tightened pivots on the traditional patterns without having to send the back to the maker
the Buck 110 is a great knife (aside from monkey's, which is a bummer to hear about such a great classic) and as far as my knowledge goes, the only difference is that the older 110's didnt have as rounded edges along the handles as the new ones, so the new ones seem more ergonomic. and pending which timer period you get one youll see difference in pin numbers like the moderns are 3pins since they show the lockback pin, and scale pins, olders vary from2-4pins, the only reason this matters is for collectors perspective