Yours might be repairable. There are some instructions in the "Help" section. However Russ Austin on this site usually will be able to repair this type of equipment.
You should also be aware that not all NSS from 1963 will fit your car. Depends on tilt/non-tilt and so on. If you remove yours you will see a number on the backside. Like 652 or similar. You need a "new" NSS with the same number. Of course you could be lucky on ebay, but Russ is usually the best solution.
What's wrong with yours? I have new sliders if the post is the only thing wrong with yours. I can usually repair the broken Bakelite if the damage is on the bottom. I repair them for 40.00
Send me and email with pictures of the damaged area. firstname.lastname@example.org
Thanks guys, I know what it does, but not how exactly it does it. I will try to figure out how to take it off the steering column this weekend and see if the problem is clearly evident. I will send photos once I have the exact part number and more information.