
...also, cutting the outer into three needs to be a clean cut as its the twisty bearing and you dont want any binding

Thats what I did, slid the inner through the three outers with the two plastic washers and dropped the whole caboosh onto hot glue in the slots (quickly!) in the chopped-but-reassembled wing pieces. This was the point where I discovered that if you smooth it with a wet finger like bathroom sealant, hot glue is hot
Nearly all my gliders use a single cell