A simple bicycle brake handle mounted to a truss at a convenient position completes the system. FEEL THE SHADOW ASTRONOMICAL LEAGUE - ALCON/ASTROCON 2017 August 16 - 19, 2017, Casper, WY The clamp came from a battery charger, and the rotor is made from sheet metal. http://astrocon2017.astroleague.org That's what I like to see in a telescope modification: something easy to build and easy to use. Giulio's parking brake is both. Giulio describes it as ". . . a simple little working idea that will not add more cumbersome hardware to assemble and disassemble," and I couldn't agree more. It's the sort of thing that makes perfect sense the moment you see it. And once it's installed you can switch from a 31-mm Nagler to a 10-mm Plössl without rebalancing your scope or even losing your target. That's quite an accomplishment for such a simple modification. Learn more about Giulio's many ATM projects at tinyurl.com/grqbgzy. ✦ ✦ Design ✦ Manufacturing ✦ Installation ✦ Retrofitting ✦ Asteroid Trackers Identify Potential Hazards Jerry Oltion plans to install a brake on the new travel scope he's building based on last month's column. ✦ Optical Servicing ✦ photo: NASA, NSSDC DFM Engineering, Inc. 1035 Delaware Ave., Unit D Longmont, CO USA 80501 Phone 303-678-8143 Fax 303-772-9411 sales@dfmengineering.com www.dfmengineering.com Do you have a telescope or observing accessory that S&T readers would enjoy knowing about? Get featured in Astronomer's Workbench by e-mailing Jerry Oltion at j.oltion@sff.net. Upgrades / Repairs ✦ Observatory Design Consulting ✦ Sk yandTelescope.com November 2016 67http://www.obsessiontelescopes.com http://astrocon2017.astroleague.org http://www.tinyurl.com/grqbgzy http://www.dfmengineering.com http://www.SkyandTelescope.com