Top is the TC14EII, Right is the TC20EII and left is TC1.7EII
Examine the TC20, bottom right; see the small metal tab below the screw
at the 12 oclock position. I removed that from the other 2 converters.
Removing allows the converters to stack on the 2x TC20,
but has no adverse effects on the normal function of the converters.
(Be aware) The 14 and 17 will not stack on each other, however.