Yes the old #11 cap Knight rifles have a nipple screwed into the breech plug. You do not need the red jacket holders. Just a long straight #11 capper and you can put a #11 cap on there with ease.

To cock the rifle, pull the black knob on the back, straight back until it locks. Then the second safety is you have to screw out the knob you pulled past a red mark on the shaft. An easy way is to screw it all the way back. Now the rifle with the side safety off can fire. If you want to unarm the rifle, screw that same knob in, and when you pull the trigger, the hammer will not hit the #11 cap.

To remove the nipple you need a long nipple wrench. I am sure that is not included. So you will have to look for some kind of after market. I use one from CVA for the Staghorn. It has the nipple wrench on one end, and then a straight bar standard screw driver head on the other. Once the nipple is out, you will see what there is a place for that. Or you can use a large heavy standard screw driver.

The trigger can be removed as well for easy cleaning. I have the manual on my computer in a PDF file that will open with Adobe. If you want it sent to you let me know. Or you can download it from the Knight rifle site. It will include the Wolverine, Bighorn, and Disc..