Need immediate help with a Mansfield type fill valve. After an adjustment, water comes out of the top like a waterfall. Sometimes it can be adjusted to slow down, but it still fills the tank too full to the point water goes into the overflow tube. The toilet shutoff handle fell off, and the main shutoff handle doesn't work, so need an immediate temporary fix. Cannot afford replacing the fill valve, even if the water could be shut off. Could someone detail a quick fix for the Mansfield fill valve (and the toilet shutoff valve)? Thanks.