Now attach the strings and balls to the structure with the gold brads! You are nearly done! Below are the necessary lengths of string to achieve a 1 minute period for the entire wave effect. Essentially it is timed so that each ball has one oscillation more than its' neighbor. For example, the longest string achieves 51 oscillations in one minute, the next longest string achieves 52 oscillations in one minute, the next one achieves 53 oscillations in one minute and so on. The shortest string achieves 65 oscillations in one minute. I imagine that as long as you ensure each string has one oscillation more than its' neighbor you are fine (the number 51 will ensure that your end result is a one minute long wave effect period, but if you started at 50 oscillations in one minute, you only end up changing the length of the wave effect, but it still works just the same).Here are the approximate lengths from the longest string to the shortest one:33.0cm31.3cm30.4cm28.9cm27.2cm26.5cm25.3cm24.6cm23.6cm22.7cm21.9cm21.2cm20.8cm* Now keep in mind that these are rough estimates and may take further tinkering to perfect. I found out that this process is very tedious as the smallest adjustments can make a huge difference...and can take hours. So be patient! Your patience will be rewarded.I filmed the wave pendulum before painting it... got a little impatient and wanted to see how it turned out before I painted it. (I will post a video really soon showing the wave effect my pendulum produced!)My dad loved it! It works great on his desk, and I must say I find it to be oddly calming and transfixing to watch the wave effect. I am really excited to see how my mini one turns out.If you have any questions about how I made this I will respond to comments as quickly as I can!