A new prototype. Trunk unit for field telephone exchanges.

[dsk]

Later I saw the need of some led indicators to see if line polarity changes. (Depending on the setup of the ATA)
Easy fix  

What happens if I go back in time?  My WWii German exchange did not fit perfectly the jack, the plugs were 1.5 millimeters to long    so I took just a little plastic, drilled a hole, and glued it on the jack.  Not universal anymore, but easy to remove. 

Well, I do not have anything that not accepts DTMF anymore, so after seen a picture I decided to be a part of the moder world   DTMF pad, and not rotary.   I removed the original rotary dial, made strap where the pulse contacts were, and connected the dial to the 2 other terminals.

But fixing the new dial-pad was not easy. I am not able to get longer screws. 3/16" x 24??  but I drilled 2 holes and fixed it as you see on the picture, but first I had to remove the original connector with its metal holder, and I had to extend the wires.  When I put the dial-pad as lo as possible, I get an opening for the wires.  This is how it turned out.  

What may be better?
The battery will be tough to change.  (but that is not often)  This type of battery is not easy to get so an external box wit 4 AAA batteries will probably be better.  I may be better on drilling those holes, and I had to move one LED to get the space for the dial.  With longer screws and a nut on each, it would have been less trouble to get it mounted. 

[dsk]

Photo of the trunk in use (Led's on)