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The rear end cap is held on with two bolts - one on each side. Once those bolts are removed, it should slide right off.
If you are trying to take the end cap off completely, you have to remove the bolts.
There are two bolts with washers. Also, the endcap is one piece, and also supports the machine - it is in direct contact with the floor. If you want to take it off, you will have to lift the end from the floor to do it.