New extra - slim split Grin twist throttle. With a 36mm outer diameter, it fits neatly under lever shifters. It comes with a 50cm cable length, specifically designed for CA3. Requires a handlebar tube inner diameter of 17mm or larger. Note that it won't fit aluminum handlebars with thick sidewalls.

Using your Grin Left Extra Slim Split Half - Twist Throttle is easy. First, make sure your handlebar tube has an inner diameter of at least 17mm, as it won't work with aluminum handlebars having thick sidewalls. Then, attach the throttle under the lever shifters. The 50cm cable is for CA3, so connect it properly. When using, just give the throttle a half - twist to control your speed. As for maintenance, keep it clean from dirt and debris. If you notice any issues with the cable or the twisting mechanism, check for damage. Avoid getting it wet for long periods as it may cause rust or other problems.