「Coarse shafts seen sitting on mats with rods raised on both sides and some sort of emissions」as SITTING CROSS-LEGGED, perhaps while sifting through what had been collected in one's poultice, SIEVING the GARBAGE BAG.
「Bamboo」woven into the shape of a sieve,「carefully selecting」a certain object size or larger from a mix of material by passing smaller material through the weave holes. Old replacement glyph (㠱) also refers to a bamboo sieve-like container or basket that could hold as its contents the pieces of a「decrepit penis of mine」afflicted with syphilis and losing chunks here and there, but still provide sufficient air flow to promote healing, however unpleasant and stinky that may have been (厶).
A GARBAGE BAG, a place for flinging chunks of rotting meat from an infected scrotal region. WINNOW means to separate by means of a current of air, rid of undesirable parts, blow away garbage, to examine closely in order to separate the good from the bad.
[ https://www.thefreedictionary.com/winnow ]
Needless to point out perhaps is that someone with a bamboo basket fastened over his groin would more likely than not be SITTING CROSS-LEGGED. A「dust basket」or「dust bin」is a euphemism for a garbage pail, trash can, place for flinging useless scraps of meat, a container for household rubbish.
Not a sitting position assumed by most females most of the time…sitting with crossed legs that would necessarily display fully one's groin. Bamboo strips were cut when green and pliable and woven into baskets. One of these uses was as a protective supporter, exactly as a codpiece was used in Europe and an athletic supporter with cup is used by male contact sport athletes today. The basket not only provided some protection against painful and unwanted contact of sensitive infected areas, but enabled a poultice filled with mashed grains and herbal treatments to maintain constant contact with the infected areas, provide deodorant functions, and hold absorbent batting. Wearing this device hampered movement and caused folks to SIT CROSS-LEGGED.

External source definitions …excluding politically incorrect concepts and other meanings deemed offensive today; may include extended definitions, euphemisms, and mnemonics)
Chinese: winnow basket
Japanese EDRDG: winnowing
Unihan extended: sieve; dust pan, garbage bag

Used within names (nanori)
みの