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wool or marbles retention

Posted: Wed Apr 22, 2020 5:39 am
by buttle007
Is there a standard way of retaining the copper wool or the marbles into the column of a reflux still?
I could imagine if you just pack the wool up there the natural sponginess of the wool may keep it in place... but what about marbles or stones?

I have not yet begun my build but this is the only thing I cannot pre-visualize.

tnx
Can't wait to get soldering ;)