[GreenKeys] 14TD with chadless tape

[epvgk at limpoc.com]

I'm messing around with this 14TD that came as part of the model 19 set. 
I'm finding that it is always 100% error-free with fully punched tape, but 
somewhat error prone with chadless tapes from my reperf. The tapes from 
the reperf are error-free. (i checked :)

It seems like it's maybe not pushing hard enough to lift the lids on the 
holes all the time. The first time a new tape goes through it is the worst, 
and after 3 or 4 times through it's mostly error-free. The tape clearance
and the tape cover latch are in spec according to the manual.

Is there something I am missing, or are the springs just worn out, or does
one just need to run a tape through it a couple of times before it reads ok? 
(BTW according to the manual, there are 3 kinds of tape cover, and mine is
the first of the two types claimed to be ok for both chadded and chadless 
tape) 

any suggestions? 

eric