Using your 31.8mm diameter threadless alloy bike stem is easy. First, make sure your bike is on a stable surface. Loosen the 4 - bolt handlebar clamp, place the handlebar in the clamp, and then tighten the bolts evenly. This will ensure a secure fit. Remember, this stem is not designed for carbon handlebars or carbon steerer tubes, so avoid using it with those. For maintenance, regularly check the bolts to make sure they're tight. If you notice any signs of wear or damage, it's a good idea to replace the stem. You can clean the stem with a mild soap and water solution. Just dry it thoroughly to prevent rusting. With proper use and care, this stem will serve you well on your biking adventures.