[r-t] Variable hunt treble-dodging minor

[Philip Earis]

A couple of years ago Richard Smith was interested in ringing a 
treble-dodging minor method with a variable hunt-bell, which was 
all-the-work for all six bells.

I'm sure he'll correct me if I'm wrong, but I think he thought the only way 
this was possible was ny using Hudson's group 
(http://www.ringing.info/bdp/peals-in-parts/parts-1.html).

Richard trawled through the options, and found that the only possible 
treble-dodging minor methods had at least three consecutive blows in one 
place.  We rang one of these, a rather nice London-over delight method, at 
the beginning of 2004, and called it Hudson Delight Minor (3-3.4-2-1.4-4.5 
lh2). The footnote said "This method gives all the work for all bells when 
rung with variable treble. Believed to be the first treble dodging method 
with this property to be rung" 
(http://www.campanophile.co.uk/show.html?Code=16251)

Some further methods with different treble-paths that Richard came up with 
can be seen at http://ringing.8bit.co.uk/hudson7.pdf

Now fast-forward to this evening.  I saw for the first time a copy of 
Jonathan Deane's 1993 book "Minor Curiosities". There's lots of very 
interesting stuff here, including a whole chapter on 'variable hunt'.  The 
book introduces Disley Delight (Oxford over Bourne, a &-34-1-2-3-34-3), 
previously noted only for being possibly the most unmusical out of all of 
the regular 147 treble-dodging minor methods, as well as one of Glint's 
favourite minor methods. Anyway, I quote:

"Here is a useful fact to slot into the conversation at a dinner party: 
Disley & Minster Bob are the only two out of the 2400 treble-dodging minor 
methods that exist, which give the extent when rung variable hunt.  To be 
pedantic, New Snowdrop (-34-1-5-1.34-34.1, le14) and Tuxford 
(-34-1-2-1.34-34.1 le14) Treble Bob will also give the extent, using 16 (B), 
36(S), but only with the tenor treble-bobbing throughout. Ringing that and 
calling it variable hunt would be cheating though, wouldn't it?"

Minster Bob is just Disley with a -5- section replacing the -2-. The 
composition given for Disley (which is obviously atw) uses 14 bobs and 36 
singles, and is:

  123456
  ------
S 312456
  325164
- 325641
- 325416
  351264
S 135264
  ------
5-part

So my question is, how do these extents work?