I'm not sure thickness of bracket but thought deeper the stronger and wanted to go into brick for extra strengthwhy are you mentioning 70mm???
the plugs are 40mm deep say knocked 5mm below the surface to miss the plaster thats 45mm so screw head sitting on the face off the bracket is the bracket around 25mm thick??
How heavy is the TV?I'm not sure thickness of bracket but thought deeper the stronger and wanted to go into brick for extra strength
You've answered your own question if you think about it.Less than 10kgs
the end off the screw floating in mid-air does nothing other than cause problems when it hits the wall and pushes the plug out or grounding stopping it tightening up making it weaker
there is also the chance it will shear when it hits the wall and the head gets twisted off as the weakest point
Less than 10kgs
you have a 40mm plug and want to use a 70mm screw you will need a gap to accommodate the excessive screw length poking out the back off the plug so an excessively deep hole other wise the jacking out head twisting off or screw grounding i mention about will probably happenWhen you say mid-air do you mean the gap between plaster and brick? I not sure where this gap is
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