You can make a spanner using a steel bar and 3/32 hardened dowel pins. Another quick and dirty way is to unthread the caps except for 1.5 threads worth, cut a thin leather strip to fit under the cap lip to the handle, and use a small vise grips with the leather under it to unthread. Works in 90% of the guns I've refinished and won't leave a mark. The cap is left in to.prevent the tube from collapsing. Don't get too crazy on the pressure.
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