I tried looking for an answer to this question, but couldn't find any...
I noticed that my tripper (circled below) keeps falling off. I do tighten it whenever I get the chance to. However, I've noticed that (overtime) the trippers start to get loose again. Are there any other types of trippers out there that are more reliable or are these below the best trippers for Pool these Electromechanical Timers?

This is the exact type of timer I have for my pool
I noticed that my tripper (circled below) keeps falling off. I do tighten it whenever I get the chance to. However, I've noticed that (overtime) the trippers start to get loose again. Are there any other types of trippers out there that are more reliable or are these below the best trippers for Pool these Electromechanical Timers?

This is the exact type of timer I have for my pool