@Wrecka the threaded internal bits are actually spot welded in, you need to look carefully and you will see the slight indentation also they have a small dimple which is not welded this is on both ends the right end you will notice actually sticks out about 20mm* (which means that end will be 20mm shorter) the welds and dimples need to be drilled out from memory it took about a 6mm drill, I removed mine when I fitted the "Heat Demon" internal bar heater and my ISO grips with bar end weights, if you are going to remove them I can send you a 20mm piece of a Bent handle bar which I used myself, either yourself or a competent welder can weld it on (it needs to lined up perfectly so it does not cause friction in the throttle sleeve) you then just need to use a dremel or die grinder inside the bar to bring the weld flush inside and out
*the 20 mm was from memory and if wanted I will send a piece a bit longer then you can trim back so each end is equal length to other