A female monarch lays its eggs (1) on a sprouted milkweed plant. The eggs hatch in four to five days producing tiny yellow, black and white banded larvae (caterpillars). These caterpillars (2) will feed solely on milkweed and eat enormous quantities because they are growing fast.
Roll-up door spring repair or replacement is usually around $200 - $250 for a 2 car door. If the brackets need to be disassembled to remove the springs due to the shaft not sliding sideways enough it will cost you an additional $50 - $100.
A contractor will charge $1,147 to replace an old 6-foot wide two-panel sliding door with a new one. That includes labor and material. If repair work or additional carpentry is required, the cost will be higher.