Megado Dobby sensors intermittent activation

Question - I’m having problems with my dobby box sensors. The upper sensor seems to work just fine, but the lower sensor doesn’t always connect to advance to the next pick. I’ve tested both sensors with a screwdriver and they both appear to be working fine, but getting the dobby box aligned so that both sensors work as they are intended seems to be a problem.

This is not uncommon with Dobby's in the 2017-2019 era.  In late 2020, the looms were modified to add 2 more hard bolt connections (making it a total of 4) to eliminate this need for adjusting.

HERE IS A YOUTUBE VIDEO FOR ADJUSTING THE SWITCH BLOCK

To adjust the dobby follow these steps:

1. The switch block must be within 1 mm of the sensor in order to activate.   start by adjust the switch block so that it is within 1 mm of the top sensor.    The switch block, when properly aligned should be directly opposite the top sensor when the loom is at rest.   Try to get as close to 100%  directly across, however, it is not critical to be. At least 50% is sufficient.
2. The Dobby must be perfectly parallel with the loom.  Use a measuring tape to measure the distance of the dobby from the castle of the loom.   It should be 18-19 mm.
3. Use the adjustable buffers on the bottom (left and right) of the dobby to adjust the dobby's position to make sure the dobby is the same distance from the loom at the top and bottom of the dobby.
4. Now push the treadle down to see where the switch block is relative to the bottom sensor.   It also needs to pass within 1mm.
5. Turn on your software and test the sensor's.  Top sensor activates solenoids.  Bottom sensor deactivates solenoids, so that when the knife bar returns to rest, the top sensor activates the next pick.