I talked to a major Lorinser distributor...who insisted that there were only threaded caps on their wheels...they were not really interested in helping..suggested replacing the valve stems...a good alternative if my friend could remove these ones without damaging anything else.

"Avani type locks"? Not sure if one can tell from this photo but they might well be..although from memory they do not look identical to what is shown on their website....but the caps are round not hexagonal and are not knurled for grip, and they simply spin when trying to remove. The center of the cap appears to depress, so I thought perhaps there is a special fitting for these to fill without actually removing the caps....

Attached Thumbnails