The string on a pleated RV or conversion van shade typically starts at the bottom rail, threading up through small holes in the pleated fabric, then into the top rail. Inside the top rail, if the shade uses two strings, they may and feed back down the opposite side, forming a loop. The strings pass through tension springs or grommets located inside the top or bottom rails, which keep the shade taut and hold it in place when raised or lowered. For restringing or troubleshooting, it's important to note your current string routing as designs can vary. Providing your shade brand or a photo can help in supplying a specific string diagram. Replacement string and restring kits are also available for these shades.