[GreenKeys] m28 reperf punch block

[Ken Stritzel]

THANKS for the tips Nick!

First, I would like to state some mistakes I made removing 
the punch block assembly.  I did NOT document where any of 
the springs were attached and I did not take any pictures 
of the work in progress!  The reperfs I have are spring 
retracted punch pins and fully perforated.

Fortunately, I have two reperfs (one that is for parts, and 
the other "working" with the broken punch pin).  During the 
process of removing the punch block from the "parts" reperf, 
I broke the springs and the bottom of the punch block (bull 
in the china shop syndrome).  

Referring to 573-118-800TC, I removed the springs attached to 
156172 (did not document where they went!), removed screws 
152893 (both sides of the punch block), removed 194993 and 
156012.  Slid the punch block out of the reperf.  Removed the 
two screws on the top of the punch block (mine were "Loctite", 
so took some doing to get the screws out).  Removed the two 
halves of the top of the punch block (where the tape feeds 
through).  Removed TWO 119648's from 156104 and 153267 as I 
slid 156104 out the side of the punch block.  156172 and 
170803 were removed.  Next step was to replace the broken 
punch pin.  Reassembly is next and make sure the indents of 
the punch pins face to the right (assists with the alignment 
of 170803, see the drawing for details). Install 156172 and 
then install 170803 with 153267, 156104, and TWO 119648.  Make 
sure the pins are aligned correctly and reinstall the spring 
on the third from the right punch pin (as shown in the drawing).  
Install the bottom half of the punch block where the tape feeds 
through.  I used one screw to hold the bottom half in place 
while installing 156012 & 194993 (as associated parts).  Removed 
the tempy screw and installed the top half of the punch block.  
Made sure the pins move freely and installed the punch block 
into the reperf.  Now I have the dilemma of where do the springs 
go!  As an aside, I had the punch block apart and together several 
times and the above steps allowed me to assemble the punch block 
in about twenty minutes.  An additional note is to hold the spring 
down while installing the bottom half of the punch block where the 
tape feeds through.  Also, the "teeth" of 170803 go into the indents
of the punch pins.

Hope this makes sense!