This padlock had many uses, but mine, as you can see in the first picture of this thread, had a funny looking thing attached to it. I think it was used to lock postal sacks.

I got a couple YA6 blanks and filed down one to fit the keyway. I had to file it on top and bottom, but fortunately I hadn’t to fiddle with the wardings because they matches.

Here is my first failed attempt with an old key and the new blank just filed.

And here are the pin impressions. I’m impressed (pun intended) on how good they are.
I’ve sanded the key smooth with 400 grit sandpaper, inserted in the padlock and wiggled left and right while trying to pull the lock apart with my fingers. I really don’t want to ruin this padlock so I’m taking my time and working carefully.
I’ll scrape some lines along the pin positions on the key side so I can follow them while filing.
I’ll finish this key as soon as I have some free time.
A warning if you shim these padlocks: the first two pins will fly away when you open it. Keep the shim down while opening the lock.
If it happens, don’t move the lock, look for the pins and insert them again. The pin stacks are balanced so be sure to put the correct pin in its chamber.
Cheers 🙂