Adding casters to shop chair?

[Billybaldwin3]

I have an older shop chair with metal tube legs.
The kind you can't find anymore so I refuse to get rid of it.
The problem is it doesn't have casters. I want to add them, but can't really find any way to do it.
Tried a dowel that fit snug and threaded inserts. That eventually broke.

 

[yatg]

Try this. It going to depend on your tube size.

Round Tube Inserts for Grip Ring Stem Casters

CasterDepot has been providing quality casters and wheels with above-and-beyond service since 1980.

www.casterdepot.com

 

[rick carpenter]

Show a pic of your chair and tell what the OD of the tubes are.

 

[GeoBruin]

These are my favorite kinds but don't really exist for smaller tube diameters.

S & W Round Tube End, 1/2-13 Thread, Outside Dia.: 2 in TE2-2B | Zoro

Order S & W Round Tube End, 1/2-13 Thread, Outside Dia.: 2 in, TE2-2B at Zoro.com. Great prices & free shipping on orders over $50 when you sign in or sign up for an account.

www.zoro.com

These aren't nearly as sturdy but will be fine for a chair and they're widely available for smaller tube diameters.

MEETOOT 10pcs Round Tubing Inserts Threaded Tube Inserts Plum Blossom Shrapnel Bottom Plug Nut https://www.amazon.com/dp/B0B7MKKHNC/?tag=atomicindus08-20