Interested in hearing about tube rolling experiences with the Orchid and other MHDT dacs, namely, the specific comparative sonic characteristics of the various 396a, 5670 and other compatible tubes used in the output buffer. My only experience is with the WE396a that Linear Tube Audio installed in my new Orchid.
I just used an Allen wrench.  I don't know which one it was.  It was the one that fit.
Not many sets of Torx go down to the t8 size, most stop at t10.
Fortunately I had a more complete engineering set that went to t8.
I know you can buy the t8 torx  on eBay if you cannot find a set with one in it.

BTW, A 5/64 Allen work perfectly. AND the WE396A JW tube sounds amazing right out of the box!
Since I installed a 6922 adapter (from Garage 1217), I tried various flavors of the 6dj8/6922/7308 family. Hence, I'm selling my NOS 396a tubes, including WE JW396a, Tung Sol, GE and the rare 1970 Tesla Military pinched-waist flavors.