Crushers, member of the Regulating Branch and I assume grinders are those with a penchant for hard work..

Nick,
Re "down which an inebriated Jack was hurled into the welcoming arms of the crushers... "
Which leads to the question-
"What's the difference between a grinder and a crusher?"😮🙈

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Lets not talk about Diamond Lil's 😉

The RN School of Dancing in Guz was the Avondale immediately opposite the St Levens gate - now sadly closed but still there looking just as it did many years ago

Pat, Re-
"School of Dancing in Guz or Pompy ? "
Neither. It was in Southsea near Portsmouth AKA Pompey😉

Guz or Guzz is the nickname for HMNB Plymouth / Devonport.
Originally HM Dockyard, Plymouth, then HM Dockyard, Devonport. Or 'The Yard', which led to the nickname derived from from the Hindi word for a yard (36 inches), "guz", (also spelled "guzz", at the time) which entered the Oxford English Dictionary and Royal Navy usage in the late 19th century, as sailors used to regularly abbreviate "The Dockyard" to simply "The Yard", leading to the slang use of the Hindi word for the unit of measurement of the same name.

"Oggy Oggy Oggy"😁

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Doug, you truly are a font of naval trivia! There was also an SOD in Torpoint, more commonly known as HMS Raleigh. There was also one in Guz called The Paramount, accessed by a long flight of stairs, down which an inebeiated Jack was hurled into the welcoming arms of the crushers...

"Jenny's Side Party was a group of women in Hong Kong, led by Jenny (Mrs. Ng Muk Kah), who provided various services to ships of the British, Commonwealth, and American navies visiting the port. They were known for their ship husbandry work, including cleaning, painting, and general maintenance, as well as providing other services (🙈🙉🙊) like laundry and mending. Jenny's Side Party was a well-known and beloved fixture in Hong Kong for decades, with many sailors remembering them fondly.
Here's a more detailed look at Jenny's Side Party:

Services:
The women of Jenny's Side Party would board ships upon arrival in Hong Kong and offer their services to the crew. This included chipping rust, repainting the ships, cleaning, laundry, and mending.

Popularity:
They were highly sought after, with ships often requesting their services. Jenny's Side Party was particularly known for their thoroughness and attention to detail. "

2. The term "Royal Navy School of Dancing" refers to a former nightclub in Portsmouth called Joanna's, which was popular with Royal Navy personnel. It was also known for dance lessons, particularly for naval officers, offered by instructors like Wilhelmine Ganz in the late 19th and early 20th centuries.Go for a night out at Joanna's. It was the best-known nightclub in Southsea and was dubbed the 'Royal Naval School of Dancing'.

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School of Dancing in Guz or Pompy ?

Here's another.
1, What is Jenny's side party?
2 Where is the Royal Navy School of Dancing?

It could also be mooted that there is also an unction to be applied after a particularly boisterous night out on The Gut in Malta Danger St in Gib and Wan Chi in HK is also called Crabfat...