Probably better going for a 'gripit' or similar style fixing if planning to put a reasonable amount of weight on it.
Oh it's not plasterboard, just a weird old wall. The beefy wall anchors I'm using tighten up so far and (i think) start spinning in the wall. It's pretty secure but if I could increase the friction around them I'd be happier.
@jackbepablo started
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Probably better going for a 'gripit' or similar style fixing if planning to put a reasonable amount of weight on it.