The clock is completely dismantled then cleaned and rinsed ultrasonically in top brand environmentally safe solutions and then attended to in stages.
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Firstly all internal items i.e. between the plates are laid to one side and checked for wear. These items are then brightened up by hand and any rust removed from steelwork paying particular attention to the escape wheel for bent or short teeth. Next we burnish any worn pivots and replace those that are badly worn. The barrels are assembled noting any excessive wear and removing any old clock line knots left in the barrels as these can come out and trap the great wheel when winding.
Attention is now turned to fitting all the newly treated internals into the clock plates marking all worn bushes including the pallet arbour and back cock. We then make sure that any oval holes are pulled back on centre and then the clock is bushed where needed after checking that no one has inadvertently moved over the rear centre arbour bush in the past. This causes the hands of the clock to become in near contact with the dial face at some point; we also check that the centre arbour extension itself is not bent as this can cause the same problem. Custom made bushes are installed on clocks of high quality Bergeon brass bushes using Bergeon bushing equipment are installed to others. The internals are again installed and new bushes are broached. The clock trains are then spun and tested: face up, face down, noting any stickiness and ensuring that the trains are free running. The pallets and back cock are fitted in place and the escapement is roughly examined and noted for its drops and wear. We remove the pallets again and clamp a gauge to the inner side of a clock plate to test the escape wheel for concentricity and make any corrections in situ with very fine needle files and papers. Doing this in situ instead of using the jewellers lathe is a slower process but we find it to be more accurate if the escape wheel is only a small amount out of true or has a couple of high teeth. Next the pallets and faces are attended to, polished and/or rebuilt as required, so that when the escapement is correctly adjusted the pallet arbour is horizontal to the clock plates. If the back cock has had its screw holes elongated then it is pinned to stop it moving. When all is satisfactory the clock is dismantled again and the clock plates are brightened up, the trains refitted, and the strike train is timed. The gathering pallet is left on in its correct position and the plates are pinned. At this stage the clock is oiled with quality clock oil.
Next all items belonging to the front plate are brightened up and any rust removed. The front pivots or stub arbours are refitted, then the minute wheel with its thrust. We then refit the hour wheel bridge making sure that the bridge pipe is not binding on the minute wheel extension. Next the minute hand and collet is fitted and checked for the correct amount of tension applied to the thrust washer; also that the hand collet is of the correct thickness so that the front of the minute wheel is not binding on the back of the bridge. We also check that the reverse minute wheel is in mesh and in line with the minute wheel. The hand is removed and the hour wheel fitted checking for wear and alignment. All the strike levers have their working faces smoothed and polished and the rack and tail is checked for any movement. All items on the front plate are then fitted including both hands, noting the striking sequence with its snail and correcting any misalignment.
When all is to our satisfaction the gut line is fitted whilst carefully ensuring not to score the clock line. The seat board is fitted followed by the bell stand and bell. The crutch is checked to the suspension block and bridge. The clock is now set up on a test stand and run. After approximately thirty minutes the clock is checked for recoil and the amount of pendulum swing. The dial is fitted a day or so later after ensuring that the movement is correct and running properly. All clock repairs are treated in similar manner.