I have an opportunity to purchase a 40 year old Dadant 12 frame extractor. Has the basic design of the extractor had any significant improvements over the years? Better motor? Newer bearings? The newest model looks like it has welded on legs and a new reel, but at the end of the day its still just a specialized centrifuge. Assuming everything in good condition and working order, does anyone want to hazard a guess what something like that might be worth?