I was talking to a yacht rigger today & he was fixing an aluminium plate to a mast. The plate had about 12 holes pre drilled for pop rivets. He placed the plate in position then drilled a hole in the mast. He then used this tool which he inserted through the 2 holes. He tightened the knurled nut on the end & the plate pulled up a bit & the holes aligned perfectly. He then rotated the plate to a slightly better position & drilled another hole & inserted another similar tool. He then drilled all the other holes. Removed the 2 aligners & pop riveted the plate after applying some wax to the holes ( forget the name)

In the picture the left hand side shows 2 pins of half diameter ( they have rotated out of position) which expand when the screw on the right is rotated.

He has several of differing diameter & finds them handy when hanging of a bosuns chair up a mast fixing things like radar domes as he can drill one hole then hold the plate in place whilst drilling other holes.

As a model hobbyist I would find a couple handy from time to time & would like to have a source ( He wants some more)

So does anyone know the name of them & where to get them please

Thanks

Edited By Sam Longley 1 on 26/04/2018 14:58:02