This is from smokingpipes newsletter which I found very informative-
https://www.smokingpipes.com/smokingpipesblog/single.cfm/post/doting-dottle-advice-smoking-the-bottom-the-bowl?utm_source=Smokingpipes.com&utm_campaign=96beb313b4-Sun_Sep_15_2019_DailyReader&utm_medium=email&utm_term=0_0e8b6a473f-96beb313b4-223048993
Cheers,
RR
https://www.smokingpipes.com/smokingpipesblog/single.cfm/post/doting-dottle-advice-smoking-the-bottom-the-bowl?utm_source=Smokingpipes.com&utm_campaign=96beb313b4-Sun_Sep_15_2019_DailyReader&utm_medium=email&utm_term=0_0e8b6a473f-96beb313b4-223048993
Cheers,
RR