Rskadk-
I did indeed – not a perfect solution but it works. Basically the DIY expansion bung idea that I mentioned above – a cavity fixing (M6 x 15mm) surrounded by 13-20mm rubber o-rings with a few 6mm flat rubber washers added to the bolt above the nut to act as spacers. The outer dia. of the cavity nut is 13mm and the inner dia. of the adapter is 20mm so the o-rings fit pretty well perfectly – but if I did it again I might try and get slightly wider rings for a tighter fit. When the whole thing is tightened up it just about grips the inside of the adapter, and I can push it in with my thumb to seat it. The awkward bit is that I have to clamp the stem onto the adapter higher up than I would like so as to provide enough vertical space for the whole cap bolt to fit inside. But if I was braver I would saw the bolt shorter.
Hope that helps!
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BigglesZX
@svenhöek Thanks – interesting ideas!
The internal adapter diameter is 20mm so too small for the FSA bung unfortunately. Drilling the bar-end cap is a good idea if I could also shave its sides, since it has a slight expansion in the body but the cap is a little too wide at the moment. And the threaded tube is a great hack – if I didn't already have a cap I wanted to use.
The next thing I'm trying is to make an DIY expansion bung from an M6 rubber cavity fixing, which I'm going to nestle inside some 13-20mm rubber washers. Hopefully introducing a bit of the bolt to that nut will expand it sufficiently to stay in the adapter. I've got some small M6 rubber washers to keep the nut away from the bolt head if necessary. Those bits should be arriving tomorrow so I'll let you know how it turns out!
Thanks again for the tips.