I have an old IKEA shelf with glass doors I'd like to custom fit into a space in my work area. I need to cut the shelf by 2 feet to get it to fit. I tried cutting the glass (4mm thick) with a $3 glass cutter from harbor freight, but it didn't work. Do I need a carbide tip glass cutter like this? [url]https://www.amazon.com/Carbide-Antislip-Diamond-Handle-2mm-19mm/dp/B016Q30XPQ/ref=sr_1_2?ie=UTF8&qid=1471874180&sr=8-2&keywords=carbide+tip+glass+cutter[/url]

I have a question about cutting circular holes on mirrors already mounted on the ceiling. So basically I have a ceiling with sheetrock, then 6" holes were cut on the sheetrock with recessed lights installed, then mirrors were glued under the sheetrock, then wood trims to make kind of a series of tray ceilings. Bottom line, I would like to cut new holes larger in diameter in the mirrors. The existing holes are 6". I would like to cut an 8" hole. I have seen adjustable circular glass cutting tools that looks like this. Attach to center with a suction thing, then score a circle around the glass. Then tap gently until it breaks all the way around. In my case I have no glass in the middle to attach to, but I am thinking I can fashion something if needed...then make the score all the way around. I can only tap on one side, not both...I have no access from the attic due to limited head room, plus the sheetrock and housing would be in the way anyways. Would a circular cutter work in this case? If not are there other Mission Impossible or James Bond gadget with laser beams that may work? I don't want to get too deep into the reasons behind this project, but if you are curious you can read a related thread in electrical & lighting even though the solution has nothing to do with electrical or lighting. [url]http://www.doityourself.com/forum/lighting-light-fixtures-ceiling-exhaust-fans/570352-removing-recessed-light-housing-mirrored-ceiling.html[/url]