The Dutch AGM produced a DIY tapered handlebar for the ISDT project.
It needs some TLC but I am happy with finding these tapered bits .
ISDT handlebars did not use the helix type of twist grip, for quick cable replacement they used a outside cable + a spare one taped alongside it.
This helix type looks like a (according to Cornucopia) a BSA internal Amal twist grip type 51.
It has a thin sleeve over the helix tube and the assembly is missing the small throttle cable block.
Somehow it found it's way on to this tapered handlebar.
I think I fit the 'normal' Amal twist grip and weld up the cable exit hole
solid bit soldered in....now removed.
Again a piece of 1" tubing from the orphan swingarm frame comes in handy
At this stage I can apply the knurling.
Have to take out some brass solder on right hand side before welding.