Initial disassembly of movement for first cleaning.
Further disassembly showing mainspring barrel.
Underside of top plate.
Oil hardened and dried on underside of top plate fourth wheel.
Balance bridge disassembled for cleaning.
Balance wheel ready for hairspring to be removed.
Replacement of roller table and hairspring
Balance placed in Jacot tool after pivot is straightened for planing of pivot.
Checking movement of balance after straightening pivot.
Changing the old mainspring.
Measuring the barrel size.
Measuring the thickness and strength of mainspring.
Old and new mainsprings.
New mainspring fitted.
Checking balance for weight distribution.
Removing the impulse jewel roller table.
Impulse jewel roller table removed.
Removing balance staff from the balance wheel with a stake.
Dissasembled old balance staff with upper pivot too short.
Measuring tools to determine pivot diameters.
Gravers used to turn new balance staff.
Rough measurements of balance staff dimensions.
Initial comparison of staff length.
Initial turning of staff.
Upper pivot finished and measured in situ.
Upper pivot work.
Upper pivot evolution for balance seat.
Fitting the balance on the balance seat.
Balance staff before being parted.
Two staffs compared. The new staff will undergo more finishing and adjustment.
Stakes to fix new staff to balance wheel.
Stacking of balance staff to balance wheel.
Balance staff stacked to wheel.
Checking trueness of stacked balance wheel on balance staff.
Adjusting the length of hairspring collet seat.
Balance before installation of roller table.
Balance with roller table fitted.
Turning of brass hairspring collet pin holder.
Testing the dimeter of splinter with collet.
Splinter and hairspring before being united.
Filing the splinter flat on one side to not bend hairspring when pinned to collet.
Table to fix hairpring flat onto collet.
Hairspring stud and collet fitted to hairpring, the position of the collet at dead center will be adjusted.
Fitting hairspring onto balance staff.
Two copper timing screws are chosen to regular isochronism.
After platinum and gold, copper screws are the heaviest.
Reducing the weight of the screws.
Placed on a small scale.
Testing their weight.
Restoration of the hairspring regulation index.
Shows surface rust, pitting.
Underside will be cleaned as well.
Initial removal of rust on sandstone.
Cemented with shellac to jig polishing tool.
Cleaning of hairspring pin.
Mid polishing on graduated diamond paper.
Final polishing on zinc plate with diamond paste.
Cleaning the face of steel bushing for ruby end-stone.
Polishing interior concave.
Finished polishing. There remains some pitting which will not be removed.
Semi finished, screws also received light polishing.
Hairspring stud also polished.
Finished balance bridge.
Placed in container for timing.
Further cleaning of gears, escape wheel.
Cleaning surface rust on the rocking bar setting and winding mechanism.
The rocking bar.
Still some rust present, but its removal would compromise the piece.
View of the underside.
Brass hour wheel before cleaning, tarnished, near black.
Placing in crown chuck.
Polished minute wheel.
Polished hour wheel.
Mainspring safety stop work sourced from period movements.
Creating a holding screw of the mainspring safety stop.
Parting the screw.
Cutting the slot.
Mounted safety stop that was missing from the movement.
Poor timing revealed that the mainspring arbor was not sitting true in the barrel.
Truing seat of mainspring arbor on the mainspring wheel.
Timing weight placed on two-sided tape to facilitate positioning in chuck.
Drilling of balance timing weight.
Center mass drilled out to lighten weight.
Further tuning of balance staff on a Jacot tool.