 Quad Switch ROPE Wall Plate VENETIAN BRONZE 126416 US $14.39 
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Which fixing is best for the job – The force is straight out/pull (tension?). Shield anchor or poly resin?
in a rendered brick (London) wall.it holds a 4mm steel rope with a span of 7m, which holds the tail edge of a 25m sq tarp canopy along its whole length, and is currently fixed with an M8 raw bolt eye shield anchor, doing the job fine, but the bolt has pulled out about 6mm over the last couple of days. The shield is static, just the bolt and presumably cone is pulling. Maybe I didn’t tighten it enough – but didn’t want to over tighten. It has been windy so there will be a constant on/off pull out force. Steel rope initially tightened with turnbuckles. Any ideas or tips appreciated. longer/deeper resin fixings to a staple plate appear to be the gold standard, but a quick fix or more efficient re fix (gripfill the hole?) would be better. Or just keep tightening?
Never easy to know what you have got going on behind render, which can cover a multitude of sins. The fixing is only going to be as good as the material you are attaching to no matter how fancy dan it is, in this case you could be into lightweight block or a rough mortar joint.
If it's stock brickwork and you are into a brick rather than a weak lime mortar joint you might be able to get away with re- tightening, although if youar near an edge there is a possibility of it crumbling. Worth trying first - slacken off, tap back and retighten.
If that doesnt do it , and if you can get to the back of the wall my inclination would be to use a length of studding, an eyenut on outside and regular nut c/sk below internal plasterwork possibly with a spreader plate. This should be highly resistant to pulling stresses, and doesn't really depend on the condition of the wall. That's a fair size sail you have going on there so you are right to be cautious about the fixings.
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