OK, sorry slow to get back w you. IMO The CF armtube does not need damping w lLyra, This is based on two listening sessions w Lyra Atlas. it does benefit my Delos on Aluminum. Paddle is about 25% in fluid. IF you have aluminum arm tube i advise a three step process. Listen with empty trough get sonic baseline, Remove the empty trough / paddle get sonic baseline. Reattach trough / paddle fill to various depths get sonic baseline. Revert to configuration that sounds best. As Ralph mentioned most users seem to use no damping and some go so far as to remove the trough. Jonathan Carr of Lyra suggested i use a ceramic spacer w lightweight Delos, i don’t think you need it w your cart but it does help bass in my system. Finally another J Carr mod is carefully heat shrink the fingerlift. I have the upgraded silver wiring. Lock down VTA tower. My TT comes w a very unique design clamp and platter so i won’t get into that. Your sandbox sink and mass loading good, as you know, mass alone not enuf. This all sounds fussy but i got thru it in a long afternoon. If you get to SoCal, stop by for a listen. Enjoy your gift !!! best to you
Jim