I had 2 kryptonite lock barrels that the U part was cut by some thieves with bolt cutters.

I trashed them, but then decided to keep them as evidence prints etc.

Had them laying around buried in my bike junkbox. I always loop my chain through the front wheel to prevent theft, in NYC I see plenty of bikes locked up missing one wheel.

So it occurred to me that I could use a kryptonite barrel if slightly modified.

Here are the results of my tinkering.

Step 1: Repurposing Kryptonite Lock Barrel

I decided the the easiest way to do it was to remove the brake posts from the front fork and replace them with modified bolts. I have disc brakes, so I didn't need the posts.

So I measured distance between brake posts and cut as needed.

The one on the left is the modified.

First I removed the plastic cover so i could reuse it.

Think I cut 1-3/4 inches from original barrel. I used a 4 inch grinder with a metal cutoff wheel.

Then you to cut a rectangular slot, do this after you figure out the bolt lock look at next step.