Re: rcbs electronic powder trickler
The latch on the left side of the tube is to remove the cover. It has nothing to do with the tube itself as it can be removed seperatly. When you remove this cover, you can get at the powder trickler, in order to clean any powder from it.
It is not nessesary to recalibrate the unit from one powder to another. I do recalibrate it every time I use it, as this is recommended in the instuction manuel. It has always been dead on, when I weigh the loads on my other scales.