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I got a pack of brass tubes from Hobby Lobby for a few bucks and they came in a package, each tube being about a foot in length. Using flush cutters is your best bet for getting the right size...

In my (never humble) opinion, sleeving is the better choice not only due to the durability of it, but also because it's really easy/idiot proof. The very first razor I did needed to have a sleeved...

Hobby stores have them at times -
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There are also sites that sell nickel/silver rods and tubes. The epoxy method will work, but sleeving it is a long term fix.

It's actually quite an easy fix and I've had to do it on most of the razors I have worked onSleeving an oversized pivot - Straight Razor Place Wiki

The long and short of it is you get brass tubing...

Getting the appropriate size ball pein hammer/jewelers hammer will save you a lot of heartache. Anything above six ounces will run the risk of bending the brass/nickel silver rod if you aren't...