Hear are some pics of doing the felt. This loader already had the felt in it, but I'll try to show how it's done.
Start by peeling back part of the backing paper and tape a paper leader to it. You will use this to pull the backing off when it's in the slot.
When felt is in the slot, stick the exposed felt to the inside. As you pull the backing off, follow it with a credit card or similar to press the felt onto the loader.
Save the backing paper and place it on the felt side of the second felt strip. This will help get it into the slot
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repeat for the second felt strip