I recently bought a rev 3, 2004. It had a tube in the rear.
Had a couple of punctures & decided to get it back tubeless.
Biggest advantage of tubeless I could see is being able to run at lower pressures with less chance of puncturing.
Did all the usual things you see on the forum, new rim tape (new type with integral valve) cleaned it etc.
Leaked through spokes & rim.
After many attempts I went for the following method, it worked perfectly.
(1) Fit rim tape
(2) Bead of Sikaflex applied between rim & rim-tape (not under rim tape)
(3) Let cure for 24 hours
(4) Fit Tyre
This stops any leak through the spokes.
I still had a small leak through sides of rim, I added 'Puncture Free' - OKI offroad puncture into the tyre.
This sealed up any rim leaks.
I am hoping it will also sort out any small 'nicks' during competition.
My tyre loses no pressure.
Fingers crossed !!!