The link you showed me above is for a pair of PoweriSer stilts
The poweriser logo is as follows:
The link below shows a poweriZer logo
The reason why we are asking these questions is even though they look similar they are different products and brands altogether, if you got sent poweriZer's then the person who sold them to you, sold you a different brand and not what they were advertising.
PoweriZers and Pro-Jumps are manufactured by the same company that is why I said if it’s a current version you shouldn't be having problems, however if you have poweriSer (like the ebay link) then the bracket may be different to what we sell and hence the reason why you are having problems.
...and no I didnt just look at the title and not look at the pictures
I asked you for a picture of your jumping stilts because often like in the eBay link you shared above, sellers use stock images rather than actual product images so causes further confusion
edit: Just seen your post chocl8, I would recommend using our cuffs with our stilts (or any FL stilts that are the same version) as thats the only combo we have throughly tested. I would say with any other combo, yes defo go with metal brackets but sadly its not something we sell at the moment, and for that reason, someone has already recommended trip and I have mentioned poweriSer / Skatehut