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Best left to a gunsmith
To lock it into the breech
Try e-gunparts.com. Do a web search.
There is a button at the beginning of the breach that you pusy in and the bolt will pull straight back out of the breach.
gunpartscorp.com has the best collection of Iver Johnson parts
Your rifle is a Marlin 81 made for Sears. Insure the rifle is COMPLETELY unloaded. Open the bolt, release safety,draw bolt to the rear, depress and hold trigger, slide bolt out of receiver.
I have an 80 G rifle but no clip. I would be willing to sell the rifle without the clip.
What you are describing could be a rifle that is not loaded, partially loaded or fully loaded, but, does not have a round chambered.
The answer is that you don't. Dissassembly of the "bolt" on a Auto-5 is a complicated process and should be attempted by a quallified Gunsmith, or other trained person. The bolt you refer to, is called the Breech Block. Cleaning is to be done with the breech block assembly in place. Remove the barrel when cleaning. You can always use a pipe cleaner to get behind the Block.
I would first look at numrich gun parts corp.they can be found on the web.
Thru website for gunpartscorp. Look under Savage/Stevens/Springfield. They have them in stock for $12.75 plus shipping.
Numrich sells the bolt assembly but is currently sold out. If you find one, let me know, I need one also. Thanks, Todd.