N
Newboy
Sorry about double post - bad timing on my behalf!
I suspect that you are missing the key part - a bracket to screw onto the joist that you would then hang the eye inside the cup onto.
If you can't devise a homemade solution then you need to either
a) Contact the supplier of the fitting or
b) Start visiting lighting shops/reclamation yards
to find a suitable fitting
to my mind something like this screwed to a joist would be enough to support the relatively light weights you have
http://www.screwfix.com/p/hardware-solutions-hook-on-plate-zinc-plated-m6/92396
I suspect that you are missing the key part - a bracket to screw onto the joist that you would then hang the eye inside the cup onto.
If you can't devise a homemade solution then you need to either
a) Contact the supplier of the fitting or
b) Start visiting lighting shops/reclamation yards
to find a suitable fitting
to my mind something like this screwed to a joist would be enough to support the relatively light weights you have
http://www.screwfix.com/p/hardware-solutions-hook-on-plate-zinc-plated-m6/92396