If you compose a lot, buy it. This thing works GREAT. The setting takes a bit of getting used to - you need to make very small adjustments to the speed dial to get the correct flow rate. I have no idea why either, but most sealants and adhesives seem to get rid of less air bubbles (those pesky caulking gaps). Practically absent in both small and large cartridges. Really saves a lot of time and effort. Changing the cartridge size requires a Phillips screwdriver and about 2 minutes. If you have not lost or misplaced any items. Be sure to check prices if you need cartridges in both sizes, as you will save money by buying a tool in one size and then buying an additional cartridge holder in a different size. When I got mine I saved about twenty dollars by buying a tool with a large holder and then ordering the small holder separately.
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