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I wouldn't dremel anything in the hop up chamber - customizing stuff with a dremel has too much margin for error and will more than likely cause an airleak and you'll just end up throwing the part out.
For the hop up sleeve i use SPIT. simple enough. It dries and leaves no greasy residue - anyone who lubes their hop up insides with some form of grease is a boner. It ruins the friction the nub/sleeve combo when contacting the bb - however some will argue but i've read plenty of posts that say its a no no on here.
I also remember txting you saying that spring is too stiff and if ANYTHING - to stretch it out a bit, hence the appearance of your battering dying - it just wasn't able to pull it.
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