Paul -
As I recall, you do NOT pull on any of the metal parts. You pull the thick end of the white nylon slide wedges toward you - it slides within the brass track, which is fixed in position. In your photo, I am not seeing the nylon pieces, which mystifies me.
You may find more info by getting the manual for the Electra-Magic Model 80 directly from the Thetford web site. The pictures (sketches, actually) are pretty clear.
A couple of our members have reported that when they tried to remove their toilet, they found that the wedges had been installed backward. I take this to mean that the thick end was toward the back of the toilet, rather than the front. I'm not sure how it could be installed that way, but that is what was reported, and you are saying that it looks that way to you. In that case, you would indeed have to push the wedges away from you, and then reinstall them correctly when you put it all back together.
Let us know what you find.
Bill
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