I will guarantee your expenditure of time, effort and fuel to go source the ready made object, was easily beaten by my simple fix. Some of us are just more practical.
i use roller catches now very easy to install you have about 6mm off bad adjustment before they let go
get some 4x5/8" or 3x15mm screws and throw the supplied screws away https://www.toolstation.com/twin-roller-catch/p42384
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