Hello All,
Another option could be to measure the outside diameter of a 7 mm socket and match it to a drill bit. Centre punch the 7 mm hex head bolt and drill it out while enlarging the recess hole at the same time. The thickness of the voltage adaptor should allow enough length of the bolt to use some vice-grips on to undo. It means sacrificing three bolts which will need to be replaced.
Again this is something that should not have to be done just because of poor design.
Kind regards
Lionel
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1940 Chevrolet MCP with Holden Built Cab (30 CWT).
1935 REO Speed Wagon.
1963 Series 2A Army Ambulance ARN 112-211
Series III ex-Military Land Rovers x 2
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