Can a screw, screw up your working? Yes! I found that out the hard way.
The MH fittings that I had acquired online for the GLMT had very good looks, light and were most probably sourced from China, manufactured to American standard. The bulb holders were in pairs for the two ended bulbs neatly built ceramic that were attached to the body of the fittings – with screws.
The holders felt loose to touch and that I thought was due to loosening of the screws from the vibrations of transit. One of the holder had even come off and broken, I had complained about it and the seller had couriered the replacement promptly. Not expecting any problems, I tried to tighten them using a driver. It was then I found out that some of the screws were too short and just made it to the screw housing of the body of the fittings. I needed longer screws.
Taking one of the screws to match the thread, I searched all the places of the town for the size I needed, I was willing to accept even longer ones for I could always trim them to size, but the thread had to be the same. The thread stumped all my sources as it was American standard and the screws used in this country were usually of British standard. The thread had to be matched; the screw housings were raised tubular structures made of what looked like antimony; too fragile to be tapped to change the thread. The other alternative was using a slimmer, longer screw and then drill through the housing and using a nut on the outside of the body of the fitting. An unacceptable alternative, to be accepted only as a last resort, for it would open out unprotected spots which would corrode in the high moisture atmosphere of the aquarium top, with time. Unless I could match the thread, I was screwed.
A friend was going to Kolkata (Calcutta) to get some supplies for his business and offered to get me the screw if it was available there. Beggars cannot choose, I put the work on GLMT on hold, and decided to wait for the screw.
It finally arrived yesterday and now the MH are wired and tested and working. My heart is working too, and I now intend to finish the rest of the work