In an English lever with fusee and chain, the fitting of the barrel is a very simple job, the barrel being merely a brass box. Take the rough barrel and broach out the bottom hole to fit the bottom shoulder of the barrel arbor tightly. Serve the cover in the same way. Then turn the inside of the cover central boss down until the top shoulder of the barrel arbor just appears through.- Turn down the inside bottom boss until the arbor has just a little end-shake in the barrel; then put in the hook and cut the chain hook-hole. For the latter, drill two small holes in the barrel and broach one slanting into the other. To turn the barrel and cover with turns, place them on arbors ; with a watch lathe, hold them in step chucks and use the slide-rest'. For a Geneva barrel with stop-work, if possible use the old cover with the stop work on. When finished, ease the arbor in the holes at top and bottom.