Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Extending my reach...

I've found the flex-shaft to be one of the most useful Dremel tool accessories. It's great for those remote, hard-to-reach areas of my work pieces where the width of the tool itself would hinder my efforts, ot it just can't reach. It took a while for me to get the hang of using it, since it required a bit more hand control than I originally anticipated. Just make sure to keep it as straight as possible, and don't bend it too much- it heats up pretty quickly, especially at the bends. And heat's the big killer of this accessory. Also, be sure to have a bit of the flex-shaft grease handy for occasional lubrication.The only thing that annoys me about the flex-shaft is that it won't accept a chuck to secure the bits, just collets. This can be a major frustration when I'm doing work that requires constant bit changes, with different bit diameters. Just when I thought I was rid of those pesky collets forever...`Late