Hi Philip, You have a couple of options. You can set it up yourself to send to the custom shop for a reshaft: www.scottycameron.com/.../

Or you can take it to your pro shop and have them set up a reshaft through Titleist custom clubs repairs. It might be quicker through repairs as Scotty typically quotes a 21 day turn around and longer on restorations.

Can I not just buy a shaft online and replace it? It’s just a single bend shaft. My only concern is that I know some Scotty’s have special tip sizes.

is there a way to just buy a shaft online or through scotty and replace it myself?

I would just send it in to SC Custom Shop. The primary reason is that if you ever go to sell it or just want to send it in to the custom shop your reshaft (outside of custom shop) will void authenticity or ability to have future custom shop work done.

IMHO, Chris

If it if was a putter with a standard shaft then it would be easy to pick up a replacement shaft but as the California Fastback has an offset stepless shaft, set up by the single bend shaft that makes it more difficult to purchase off the shelf, and having tried to refit a similar shaft in an Odyssey putter they're very difficult to align to get correct to match the face.
I suggest you follow Cathy's advise and take it to your pro shop and have them set up a reshaft through Titleist custom clubs repairs, or use Scotty's repair service.

My SC Select Fastback came with the shaft manufacturered in Japan. The label says the shaft was made in Japan, the head in USA, and assembled in USA. Is that normal, or did I get a Japanese model?

Some of Scotty's putters parts are made abroad however the heads are made in the USA.