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I'm no expert on fencing
Me neither... they are 100mm posts in what were sold as 100mm spikes and the interference folds are holding them but not jammed upright solid, there is some play. I've stuck some 5 x 30mm screws in as a temporary hold for now.
rhb-
Construction grade timber is often (actually almost always) dimensioned when it is very green. Therefore unless you're buying something like CLS (which is for studwork so all dimensions MUST be the same) the dimensions of the timber will change as it dries out / seasons.
TLDR it probably was 100mm when it was dimensioned but has dried out.
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I'd knock some wedges / wooden shims down betwixt posts and holders.
Bobbo
dbr
Err I'm no expert on fencing but aren't the fence posts supposed to be tight to the walls of the spike holders? As far as I'm aware they're meant to be held in by friction, the bits of metal that are folded in where you're driving the timbalock are essentially there to increase friction.