THis is one of my favorite shabads you have posted. I too use to think
how can one keep his chit on Gurmantar when doing non-manual labor
work.
Im no expert in this field, but I have learned the subconscious mind
is very chanchal. It goes from one thought to another thought. Its always
thinking of something . Even when we are studying or working on some
"white collar" task the mind is always not focused on the task, but instead
focused on something else whether it be ones family, friends, hopes for a
promotion,etc. Because of this wayward thinking man forgets Waaheguru and at
the same time completes his daily tasks unfocused.
So I think the trick is to train the subconscious mind to think about WaaheGuru. The
subconscious mind is going to think ( contemplate) about something so why Not have it think
about WaaheGuru. THis way the mind will be less wayward and it will be more easy to complete ones
daily chores since they will be more focused. Yes this does take some training but there are some
tips that we can learn from MahaPurash. For example, Bhai Randhir Singhs Ji mentions that one
by doing Naam Abhyiaas during Amrit Vela with single minded concentration then the Naam pendulum gets active meaning ones chit ( subconscious) is thinking about WaaheGuru throughout the day even when doing daily chores.
If the Puratan Singhs could fight wars and keep their mind on WaaheGuru surely we can complete our tasks
and stay focused on WaaheGuru as long as we keep rehat like Amrit Vela, Bibek, Kirtan Sadh Sangat, etc.
Bhai Raghbir Singh Ji(?) mentions that when the mind starts to stray start reciting Gurbani. So perhaps its good also
to memorize some pauris or pangtis from Gurbani this way when ever you are at work and feel like the mind is completely
forgetting God then you can recite Gurbani to motivate you to do naam jaap silently.