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SUCCESS !!!

You are measuring the wrong side. You need to be looking at the other side of the door. The measurement you need is from the edge of the door to the centre of the external cylinder. The picture is now allowing me to identify the lock as a 50mm. Check that on the outside: edge of door to the...

What you are showing is a Union drawback rim lock. Imagine you have just come home and are outside, you put the key in the cylinder and turn. You step inside and close the door, you are now looking at the backset. The cylinder has a piece on it that comes through the door to pull back the lock...

From the outside the measurement you need is the centre of the cylinder to the doors edge. 40mm and 60mm are the most common but other sizes can be found. DC

It is an easy job to disable the snib. Can you post a photo ? We do it for communal entrance doors. There are escape versions of the night latch known as egress locks but tend to be quite expensive. DC

The problem is shave off some wood and when we get the next drought (and we will) you will want to add some insulation to stop the draft. Check that the top edge and bottom edge of the door is painted or treated correctly. DC

"i never got one right lol!!!" That made me laugh crank. I think what I am looking at is older version of the British Standard sash lock. (The photos could have been better). As such it will have hard plate covering the vital area and a normal HSS drill bit will not take you through it. At...

It is a Legge key and hopefully a Legge lock. Next step, take of the handle and post a picture of the area where the key hole is. I can see something in the key way. You should be able to see no obstuctions. The colour of the lock case will give a clue to what version of Legge lock it is. DC...

Glad to here. DC

£ 9.99 plus £ 4.19 postage is a bargain. I would sell you a Yale cylinder for £ 14.99. I suspect that it is old stock they want to get rid of. That is why the ad does not mention the dimensions. Most back sets are either 40mm or 60mm. Buy new and be safe in the knowledge that it will last many...

Best advice now is purchase the Legge version, reverse the latch and install. Then you should be back in the same position before the old lock fell apart. Teamlocksmiths, DC

Yes I see what you mean. I had missed that, so your caravan door opens outwards, most do. All the back sets that I have been suggesting are sold as an inward opening latch. Most of the Yale (brand) simple back sets can be fairly easily reversed. I do not think that the Legge back set would have...

Bit of a personal decision but the Union is over twice the price of the Legge. So even with postal charges the ebay Legge is cheaper and I don't think that there will be much difference in the quality. Just thought with all that corrosion it is worth spraying something like WD40 in on and...

50mm back set is a little more obscure. Union 1026 is another option for you. The one on ebay does not mention the size (back set) but I found another picture on ebay same company better picture:-...

You must be very near the sea. I have never seen corrosion like that. It is a Legge back set (the left hand part) (see the legs on the handle). I can not see the make of the cylinder. (the right hand part) On ebay there is a similar item:-...

Yes your ebay find will also be suitable. You may have to change the direction of the latch depending on the hand of your door. DC Teamlocksmiths.

I have had a look on ebay and Banham are selling the older 3K74 sashlock for £ 20.00. That's less than trade. Does not say 67mm or 80mm, obviously you need the 67mm. DC Teamlocksmiths.

The best advice is to go for a branded make. You will not go far wrong with the Union 3K74E (Chubb has been rebranded as Union). The E stands for extended throw. The latest version of BS 3621 calls for a 20mm throw for the bolt. You will need to open the slot in your door slightly to allow...

What is the size and make of the one you now wish to replace? Is it a conventional mortice or a sash lock (one with a handle) ? Maybe a picture would be helpful. DC Teamlocksmiths

Generally three lever locks have 100 different keys. So it is very easy to either change the lever pack or read the levers and provide new keys. BUT this is the reason insurance companies specify a minimum of five levers. The three lever is ideal for an internal door to keep a five year old out...