I didn't see this posted, so I feel compelled to mention it. Find a problem that you have not seen with your pinball machine. Post that problem with photos (might include video links) on pinside requesting help. Getting feedback from numerous experienced pinside technicians and the like with suggested actions to further diagnose or repair said problem. Finding the solution, by whatever means and fixing that problem. Then, posting the solution to said problem on Pinside for others to observe.