I’ve been focusing on how to get ridge cap installations just right lately and it’s made a world of difference in both functionality and aesthetics. Using a rubber mallet for sealing the caps ensures they sit snugly, which minimizes leaks. I’d love to hear about any other techniques or tools that have worked for you in your projects.
Using a rubber mallet is spot on! I’ve found that applying a bit of roofing cement under the caps can help with durability too. Have you tried that? 
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I totally get the importance of snug installations; it’s like putting the lid on a jar — if it’s crooked, you’re in trouble! I’ve had success using a heat gun to soften the caps a bit before setting them; it helps them mold better to the roof shape. @fionaP33, do you think that would work well with your cement method?
There’s nothing like the satisfaction of a solid cap installation. I’ve had luck with using a chalk line for consistent placement — it’s like making sure all your ducks are in a row, right? @emily_gray78, have you ever tried that for your installations?