510 works okay, but it is a little loose, but I think it will do. And I broke my dental tool & bent my tweezers getting the cap off! But I did get it off finally with my bent tweezers. This is one of those devices that ONLY children will be able to open; adults aren't equipped to do it!!
If you have a drip tip that is too loose.....just get a new "O" ring for it.....auto parts store or hardware store should have them.
And I agree...I love drip tips! But not the metal ones...I like the plastic ones.......gives me something to bite on instead of my tongue on the rare occasions that I decide silence might be preferable to a smartass remark.......
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