I have been using the 3005 and the 3006 Expert Drums for several years on a Unicolor motor base.
Several things about removing the lids:
1...Never stick your head over the top if using air pressure. Friend needed eye surgery due to this (using foot pump).
2...If using air pressure, fill as far as possible with water first. Water does not compress and less air/force will be needed to remove lid.
3...Don't stick the lids on so tight! Easy does it, and they'll come off easier and still not leak.
4...Don't use air pressure -- gently tap drum's lower edge of its lid on edge of table top etc, working around the lid, and gently lifting the lid off. Combined with #3, no damage is done to the drum.
My motor base turns the 3005 and 3006 drums at 15 RMP. I manually lift and switch the direction of the rotation of the drum every minute or so...the auto rotate feature switches direction before one full drum rotation with these larger diameter drums, so I disabled it.
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