Just back from the workshop, and looking inside the lipo retaining posts (i.e. the purple pointy bits that the R clips go into!) and they are definately threaded about 8mm into the post, but the top 8mm isnt.
I assumed I would be able to tap this out, but no luck, the darned steel seems to be fighting me and almost seems like fractionally smaller diameter than the lower (threaded) portion.
Anyone actually ever used thumbscrews in these things or is it impossible??!!!
Im almost certain that I saw a piccy of Trish with them on an SX3.
Now Im stuck with the R clips. ARSE.