Heavy-duty swivel gate castor spring loaded

A pair of new/unused heavy duty gate castors (spring loaded). Bought these for just over £80.00 (see photo of invoice) for use on my pair of new gates which were 3.5mt long each leaf but "disaster"!
The whole thing failed as the weight of the gate (one leaf) pulled over the brick pillar it was attached to! Ouch!
My loss! but if you have heavy gates that are sagging then these castors could be the answer?
Don't bother with much cheaper alternatives, because if your gates are heavy, cheaper items will not be up to the job as the spring rate will be inadequate.
I'll never recoup the cost but looking for sensible offers that will make a saving for the potential purchaser.
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