Products Products by Dave Crosby Jamb Extensions Geometric windows are great until you need an extension jamb. Then it can get complicated, unless you’ve heard about Composite Vinyl Jamb Extensions. Available for 2x4 or 2x6 construction, paintable, stainable, tan or white to match the manufacturer’s windows, they can be attached with nails or screws like wood jamb extensions. Contact: CertainTeed, 750 E. Swedesford Rd., Valley Forge, PA 19482; 800/233-8990; www.certainteed.com. LED Flashlight Using ten “super-bright white” light-emitting diodes, this new flashlight will shine for over a month of continuous use on three D-cell batteries, according to the manufacturer. The Lightwave 4000 is said to be water resistant and shockproof, with no filament bulbs to break, and the LEDs are expected to