Change or rekey · Cambridge
Vintage Mortise Lock Service
Someone painted the door years ago without removing the hardware. The faceplate, the strike and the little thumb-turn are all under several coats, the deadbolt scrapes when it moves, and the knob is stiff enough to leave marks on your hand.
Vintage Mortise Lock Service
In plain words
Interior doors are as much a part of this work as the entry. Bedroom, bathroom and closet doors in an older home usually carry a lighter mortise latch with a privacy turn button, and after decades without lubrication they stop catching or the turn button seizes. These small cases are short jobs on the bench: a clean, a spring, a new turn button spindle where the old one has sheared. Sets of interior locks are often serviced in one visit, and a bit key can be cut that operates all of them, which is how they were originally supplied when the house was built.
How the visit goesThe key turns freely in the round cylinder on the door, all the way around and back, without the bolt shifting at all. The cylinder itself wobbles slightly when you press it, as if it has come loose inside the door.
Cambridge
How the visit goes
Condition of the wood around the pocket
The mortise pocket and the screw holes in the door edge carry the whole lock, so their state is part of the assessment. The locksmith probes the faceplate screws for grip, looks for cracks running from the pocket into the stile, and checks whether an earlier repair enlarged the pocket or packed it with something soft. Stripped holes, a split edge or a case that shifts when the knob is turned change the plan: dowelling and re-drilling, a hardwood filler, or longer screws may be needed before the rebuilt case can be trusted. Finding this now avoids surprises once the lock is back in the door.
Inside the case on the bench
With the cover screws out, the case opens like a book: the latch bolt with its spring, the hub the spindle passes through, the deadbolt with its lever or tumblers, and the springs holding each in place. The locksmith notes what is broken, worn or merely stuck, then cleans the case with solvent and a brass brush until the old grease and rust are gone; old paint on the hardware is treated as a possible lead hazard and cleared with contained, lead-safe methods rather than dry brushing. Parts are cleaned individually, burrs are dressed off the bolts, and the hub square is checked against a fresh spindle to see whether it has rounded.
Keys that fit the lock, and a spare
You are handed keys made to the restored lock, counted into your hand, and each one is tried in the door before the locksmith drives away. For a bit-key lock that means keys filed to your case; copying one needs the right blanks and equipment, which most hardware counters do not stock, so the locksmith keeps the record needed to make more. For a cylinder lock it means keys cut to the new combination, with any old keys now useless. Keep one spare somewhere other than the door, ideally with a neighbour or in a lockbox, and treat bit keys gently: they bend in a pocket and a bent key is how most of these locks become stiff again.
Vintage Mortise Lock Service
In the van
- Mortise cylinder and cam
- Warding files
- Cylinder set screw
- Light lock oil
- Hardwood dowel and wood glue
What affects the quote
Same fees day, night or weekend
1Number of locks in the visit
One entry lock is the simplest case. A whole floor of interior latches, or the front and back doors together, is a longer visit, and each case is quoted on its own so the total is easy to follow.
2What is actually broken inside
A clean and new springs is the lightest job. A worn hub, a cracked lever or a part that has to be fabricated to match the original adds bench time, and the assessment names which applies before any of it starts.
3Bit key or cylinder lock
A bit-key case has keys filed by hand on the bench, while a cylinder lock is rekeyed or fitted with a new cylinder on a key machine. The two take different time and materials, and the quote follows.
Vintage Mortise Lock Service: questions
Will the door look any different afterwards?
Usually not, when the original case is repaired: the same knobs, escutcheons, faceplate and strike go back on in the same positions, and the only visible change is paint or grime cleared from the edges that were catching. A replacement case is chosen to match the pocket so original trim is reused wherever spacing allows, though an occasional case needs a small pocket or fixing change, explained beforehand.
What if the case is too worn to repair?
Then a replacement case goes into the existing pocket. Reproduction mortise cases are made in the common vintage sizes and backsets, and a modern mortise case with a cylinder fits many old pockets with minor trimming. The locksmith measures the case height, depth, backset and trim spacing before ordering, aiming for the new case to drop in with the original knobs and plates going back on, though a small pocket trim or fixing change is sometimes needed. Cutting the door for a different kind of lock is the last choice.
Which parts usually need replacing?
Springs, first and foremost: the latch spring, the hub spring that returns the knob, and the small springs on the deadbolt levers. After that, the spindle and knob set screws, a hub whose square has worn round, a worn deadbolt lever or follower, and on later locks the cylinder set screw or the cylinder itself. Bolts, cases and trim are almost always kept, cleaned and refitted rather than replaced.
Change or Rekey Locks
Vintage Mortise Lock Service near you
One team handles every service on this page for Cambridge, so a lockout can turn into a rekey, and a rekey into a properly set deadbolt, within the same visit if you want it. Each service is described separately below, but at the door they fit together as one piece of work.