The answer is:
The T1 connector is a 5/16" spade lug, but it's 0.1" thick.
In the ST models the opening for the spades is 2mm, or 0.080", just a little too slim to accept the T1.
We can easily enough retrofit a set of Bryston's new clear binding posts with 3mm/0.12" opening, for $50.00 plus 2-way shipping to Vermont or here. Hope that helps.
cwr