You don't need to be exact - the rubber will deform to some extent, and it should be possible to file a bit more off the 'high' spots where it touches - if you're thinking of commercial production, include the phrase "file to fit" in the instructions. Here's one I made while waiting for tea to brew...
You don't need to be exact - the rubber will deform to some extent, and it should be possible to file a bit more off the 'high' spots where it touches - if you're thinking of commercial production, include the phrase "file to fit" in the instructions. Here's one I made while waiting for tea to brew...