They are 3/16" and are available at hardware stores and bicycle shops, which often have them in bulk for about 5¢ each.
Have you checked the locking surfaces for any distortion? I've run into several of these that with the locking surface in the receiver damaged. I always suggest these be shot with standard velocity, or lighter. When the locking surface starts to distort metal is pushed down and this then keep the bolt from rising to the fully locked position which accelerates the damage until you can't get the action to close. These were introduced before Hi-Speed 22 ammunition and the early guns should definitely not be shot with it, they made changes for use with Hi-Speed in later guns, they did not change the lock-up much, it appears they just made changes to support the head of the cartridge more.
Here are some old photobucket pictures that show the locking surface (now under photobucket water marks).
Below is one with good locking surfaces, it was repaired by Savage after the introduction of Hi-Speed and has a new receiver (possibly due to locking surface damage?), it also has an early bolt with a later narrow Hi-Speed firing pin. The rest of the parts are all show a lot of wear.
They added a warning stamp to the barrel.
Here's an early Model 29 that was sent back to the factory after Hi-Speed was introduced, it has the same stamp added to the receiver -
Added- Here's a link to more information on the model 29's - https://www.24hourcampfire.com/ubbth...18/type/thread
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