After placing the 5mm metal LED holder, you need to box the electronics, take your
time and be patient:
Make sure that all the soldered parts have their legs cut as close as possible
to the PCB
Don’t force the parts into the holes –be gentle- , they are designed to be tight
but not forced. If they seem to be stuck, remove the electronics and start
again.
The best way to enclose the board is to try to fit all the parts through the holes
at the same time (not simply inserting one jack after the other).
It is easier is you start with the 2 jacks, the LED and the footswitch (inserting
the 4 of them on the holes at the same time).
Note: The LED has to be placed but not soldered yet. The
negative pin (shorter on the flat side of the LED) goes into
the square hole, and the positive pin into the upper round
hole.
When all is in place, you can finally fit the washers & nuts and solder the red LED.