Peters Classic Bike Parts in the Netherlands.
He also has the narrower size for the '28 (and other years) clutch

https://pcb.shopfactory.com/contents/nl/p2934.html

You should have been at the recent Sloper rally,

seen Klaus in pictures at the sloper rally, did you two not meet there ?

puzzeld

On my NG I silver soldered a threaded connector + a flex pipe from - I think- something used for pneumatics.
works well for over 15 years now.
Or if you want a even quicker disconnector use one from Festo like these :

hello Joe and welcome to this forum. re. the gauge; Apart from the gauge itself being broken (?) Oil pressure in a single only shows when there is a non return valve fitted behind the oil pump. it consist of a spring , ball and plug, they go in in that order. oil Burney (1).JPG singlebottom - kopie....

Have fun !

see pics. the color pic from Dave Barkshire's book shows a -sort of- 1927 striping on a 1928 tank. The 1928 striping was not so elaborate, just a horizontal straight line broken at the headstock opening. It's up to you, study old pictures and look at what others did. tank lining 27-28 (3).jpg 1927 :...

with a tele you can use the bottom legs from a BSA front fork.
for a girder I dont know, probably a 'thin' spindle with a sleeve, not a step.

Roger Peeter's VB from Belgium, a very fast bike !

The MkI SQ4 has a twin hub 2LS front brake made by Herman Noort.
very nice piece of craftmanship.

looks almost like a '28 , almost..
slotted holes make it later or were added later ?

my '28 front hub :