Right element means「cleared of misbehaving, trimmed and adjusted behavior, neat and tidy」but one reason why is because all the defects and unwanted aspects of a service provider's personality have been「neatly trimmed off by whacking with a punishment cane until the mind is pliant」(see 磉).
　「Stone」that is「cleared」in this manner refers to large stones that have been meticulously whacked with chisel and hammer, chipping away at all the unwanted parts, until each massive side is nearly smooth and flat. Used as CORNERSTONES, FOUNDATION STONES, or as the foundation for a large wooden pillar called a PLINTH. These stones can still be seen today at the homes of wealthy folks, temples, shrines, and castles.
　「Rocks」used with「multiple woodies」and「rolled erotica, no-longer-integrated foot, counter for small animals such as bunnies, counter for horses, masturbating males」as young sets of no-longer-integrated feet rented out to clients on a short-term basis. A PLINTH is the stone or rock that forms the base of a statue, at the feet perhaps of a beautiful divine goddess, or a pillar. Smooth and round rocks were used to crush the bones in feet of divine service providers, with those rocks becoming the starting point and foundation of the entire remainder of life as a sex slave. The CORNERSTONE of the shaman's businesses, trading, and concubine services in China for thousands of years was a「no-longer-integrated foot with many sweet and syrupy pricks」and related concepts.
　Without a doubt, the Irish also have knowledge of their own to pass along in these trying times:「Masturbation will not spread coronavirus, especially if you wash your hands (and any sex toys) with soap and water for at least 20 seconds before and after.」Nonetheless and regrettably, unlike in dynastic China, it must be undertaken alone to truly be a preventative countermeasure but still achieve the desired result with some degree of safety.
　 　[　https://www.sexualwellbeing.ie/sexual-health/sex-and-coronavirus/ 2020-03-31　]　
　The Dutch, too have the same solution—it seems masturbation has become mainstream in the media the world over due to the coronavirus (it has always been 'the main stream' in reality, albeit covertly for most folks):
　「'Don't have sex with your partner if they have been isolated because of (suspected) coronavirus infection,' the RVIM says. 'Sex with yourself or with others at a distance is possible (think of telling erotic stories, masturbating together).'」
　　[　https://www.theguardian.com/world/2020/may/15/dutch-official-advice-to-single-people-find-a-sex-buddy-for-lockdown-coronavirus 2020-05-16　]　
　Needless to point out perhaps, but Chinese shamans from antiquity hit upon the same solution as a pandemic preventative countermeasure, honed for ultimate client satisfaction by utilizing naked females with no-longer-integrated feet as masturbatory sex buddies available for short-term rental with erotic visualization of live prepubescent female genitalia engaging in autoerotic stimulation herself, as a solution to the same problem facing us now, but in pre-Internet days.

Modern definitions (that generally disregard history) …excluding politically incorrect concepts and other meanings deemed offensive today; may list only pigeonholed definitions, euphemisms, or meaningless mnemonics)
Chinese: foundation; base
Japanese: foundation stone, cornerstone
Unihan extended: foundation stone, plinth
EDRDG: cornerstone; foundation stone

Used within names (nanori)
もと