I hated the old sconce installed by the last owner, so I decided to remove the old bathroom sconce and mount a new one. In the process of doing so I ran into two issues. (1) After removing the old sconce, I noticed the porcelain wall tiles were not cut to a rectangular opening matching the size of the box behind, in addition, behind is a metal handy box. If it were me for a sconce I would mount a 4"x4" square box with a round mud ring...but OK. I could work with it and got everything wired, mounting the fixture bar was a bit tricky as I need to use extra long screws and thread in a pair of nuts to better secure the fixture mounting bar. Here are some pictures of what I am talking about. [IMG]http://i173.photobucket.com/albums/w67/143house/11th/IMAG2845_zpsalvikzwl.jpg[/IMG] [IMG]http://i173.photobucket.com/albums/w67/143house/11th/IMAG2846_zpslxtl8bfc.jpg[/IMG] [IMG]http://i173.photobucket.com/albums/w67/143house/11th/IMAG2847_zpsty7by96p.jpg[/IMG] So my first question is, should I try to enlarge the tile cutout to the same size as the handy box behind it? Or should I leave it alone? This is very hard and brittle 3/8" porcelain tile. I had two spare pieces and tried once to cut two holes (for hot and cold water supply lines) and my carbide hole saw didn't do anything. I had to take it to the tile store and they said this is very tricky to cut and they said they diamond hole saw won't make a smooth hole, instead the sliced the tile in half using their wet saw, then pushed the tile towards the chop saw a bit at a time, making a rough "U". I tried to use my diamond blade on a grinder on it and wasn't able to get a clean line on it, so I am a bit concerned about enlarging it unless there is a good functional reason to. (2) After I mounted the fixture bar and threaded in the rod, the entire fixture is then mounted onto the rod, and tightened with a cap. The cap is a metallic cone tightened by hand. I tightened as much as I can. However the light fixture is quite heavy. It tilts easy because it's heavy and wide, and it's only held by that fixture rod in the middle. Is there a way to stop it from tilting to one side or another whenever I touch it say to change a bulb or something? [IMG]http://i173.photobucket.com/albums/w67/143house/11th/Clip1_zpsmy6ajv3f.jpg[/IMG]

I need to create some sort of power source for my Raspberry Pi, it requires a standard DC cable, and what I have got is 4 AA rechargeable batteries that all add up to 24000mah. The device takes 1 watt and in continuous use that would last around 16 hours with the batteries. I need some sort of way to massively extend that time period. I'm new to this sort of thing, so I thought that I could go with some sort of thermal power that is initially powered by the batteries, and then creates more power that would in turn go back into the batteries and power the raspberry pi, this will be incorporated into a plastic casing that will attach to a hard surface, so it can't be very large at all. And solar power isn't much of an option due to lack of sunlight in the area it will be placed and it unreliability to run continuously.