Practice is the best teacher. Grab a piece of scrap glass, use this spring-loaded Bullseye Maker to create breaks, and get your practice on!
To use, place the sharp tip of the Bullseye Maker straight against the glass. Holding it in position, pull back the other end of Bullseye Maker and release. This will create a bullseye break.
Note: Photos shown are for illustration purposes only. Actual product may vary due to product enhancements and adjustments.