Many of us have been rebuilding atomizers well before a single 'rebuildable' was on the market... If someone built it once, it can be rebuilt.
I get really frustrated with some local vape shops that actively discourage clearomizers over RDAs based on the cost savings of rebuilding. All the clearomizers with the replaceable atomizers use the same basic design and are more easily rebuild than many 'rebuildables'... There are no tiny screws/pins/holes/springs, it is simply a grommet separating +/- one touches the side wall and one touches the center pin that is easily removed. Not that there aren't some awesome rebuildables on the market, and they have there place... But they shouldn't be misguiding newbs into an excessive $100+ investment based on the false pretense that the 'cheaper' devices are not rebuildable...
Not only are they easy to rebuild but it is pretty easy to get better performance than they originally come with. A cotton ball or cheesecloth wick with a 28 gauge micro-coil is amazing on a pro-
tank or ce4 and also much less prone to leaks than a stock silica wick. You could also use silica, cotton, ss mesh, etc. and use any gauge with any number of turns to make to any resistance you desire.