How do I make MT_TAILSOVERLAY be transparent?

[NordVPN]

i have been trying to do this for a couple of days now and there is almost nothing on it.

addHook("ThinkFrame", do
for p in players.iterate
if p.mo.skin == "stealth"
p.mo.frame = $1 | FF_FULLBRIGHT | FF_TRANS60//FF_TRANSMASK
end
end
end)
addHook("MobjThinker", function(MT_TAILSOVERLAY)
if player.mo.skin == "stealth"
local Tails = MT_TAILSOVERLAY
Tails.frame = $1 | FF_FULLBRIGHT | FF_TRANS60
end
end)

it doesn't work, and it has been stressing me out, making me think that i have to just freeslot all 100 frames of his tails on SOC and reprogram the entire tails overlay to be a separate object.