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Tool for recessing screw head on steel trunking cover

houstonceng

Hi all.  I’m installing some steel trunking and need to create the recess/ dimple/ sewage in the covers to fit the turnbuckle screws.   I know there is a tool to do this, but cannot find one when searching t’internet.  It’s similar to a screwed hole punch in that the bolt goes through the 10mm hole and you wind it in so that the domed male side pushes the cover material into the female die to create the recess.  Does anyone know the correct name for the tool, or who makes it, or where I can buy one?

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    I drill the correct size hole, place a suitable size socket....sorry can't remember which size............underside of the lid, central to the drilled hole and from above ' attack' with a small ball pein hammer............works a treat and no it does not damage the galv.........................unless your buying cheapo cheapo trunking...........the kind you can spit through

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    I drill the correct size hole, place a suitable size socket....sorry can't remember which size............underside of the lid, central to the drilled hole and from above ' attack' with a small ball pein hammer............works a treat and no it does not damage the galv.........................unless your buying cheapo cheapo trunking...........the kind you can spit through

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