The crushing force makes sense. I am at the other end of the scale with metal but flimsy centres in a cheap Claber hand reel.
If the immersion has heated the water above about 45 in the tank the centre of the reel - which is three segments, not a cylinder - compresses and misshapens.
It still works fine but it is noticeable.
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The lad working with me used to have a claber and it expanded so much with 8mm hose and hot water that the sides would press against the frame and not allow it to turn. Had to disconnect the reel to allow it to collapse enough to reel back in toward the end of its life.
Hadn’t considered that the expansion would put press on the plastic. I would think both the heat and the pressure would work together to overstress the plastic.
The price of the second hand one I’ve been offered is a no brainer even if it’s a plastic internal. I wonder if waterworks we sell me the aluminium centre separately.
Then there is the question of how to get it out. I understand all the bolts on the bottom half. They have even brought out some videos recently to show how to get this apart for a belt change. But I’m not sure how to get the top 2 metal bars apart without breaking it.