How can these be removed without shattering the tank?
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I would try a Dremel form tool through an abrasive cutoff wheel. Of course you have to be mindful of the porcelain. I"ve cut many screws and bolts this way.
If girlfriend can"t reduced the bolt, girlfriend may be able to cut the nut, in the direction that the bolt"s axis, climate pry the seed apart in ~ the cut line.
A an excellent tool because that this purpose and any comparable close work is a ultrasonic multitool such as a Fein, Rockwell etc. Several tool suppliers are making lock now. The other tool would be a hacksaw tongue holder. That is not a complete framed hacksaw, rather a manage that holds the blade and can gain into chop places. Remember, save yourself a most frustration and also use a good quality spicy blade, no a dime store, discount blade.
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I recommend an old-fashioned mechanic"s nutcracker. Search the network for "mechanics" nutcracker tool", AKA "Mechanics" nut Splitter". Countless tool merchants make these. This will break-up a seized nut across the flats, by hand tightening a screw that drives a hardened wedge gizmo. Functions in areas not easily accessible to various other tools, favor saws or grinders. That will ruin the nut, yet sometimes release the bolt without inflicting extr damage on the seized threads.
Then, if possible, replace with brand-new nuts and bolts of heavy brass or stainless steel. The added cost is trivial. However, it is not straightforward to uncover solid brass or stainless steel bolts, to fit toilets. It"s a secret to me, why restroom manufacturers proceed to install and also sell instead of hardware made of steel that is just brass PLATED, which will eventually rust up, leak, and also seize. Possibly, to develop work for plumbers. Much more likely, come sell more new toilets, as soon as perfectly good but leaky toilets get damaged in efforts to remove corroded bolts with hammer blows, hacksaws, electric vibrating saws, or electrical grinding wheels. Doze strategies are just too risky!