The people in Gujranwala/Sialkot/Gujrat have a high aptitude towards engineering particularly mechanical/electrical engineering, even I also had a fascination about mechanical and electrical stuff when I was in Gujranwala. I even had built a "laboratory" where I used to make various electronic projects using my tool kit like radio, sirens, timers, flip flops, bells etc.
I also used to love to try to repair electrical appliances in my home in case I could figure out the fault. My inspiration was our family "mistry" (mason) who used to be master of many skills, in additions to masonary work he was also expert in sorting out mechanical plumbing problems of our water pump, he also used to repair even our TV, VCR, Refrigerator etc. I once visited his home and he had a full "electrical/electronic laboratory" at his home, he had full knowledge about the difference between electrical "series" and "parallel" circuits, transistors, resistors, capacitors etc. even though he was not formally educated. The reason behind his expertise was that he belonged to Mistry/Tarkhan caste of our region who were local "engineers" in the villages in the past centuries and used to build homes, furniture and other devices in villages in the past centuries.
We have a high concentration of Mistry/Tarkhan caste people in Gujranwala/Sialkot/Gujrat area and they are have natural talent for engineering. Most of the small manufacturing units involving producing mechanical/electrical products was first started by them, all these fans, sanitary fittings, washing machines, pots and utensils, tiles, plastic furniture, surgical devices, sports equipment etc.
I have read somewhere that even the metal workers and weapon makers of darra Adam Khel in KPK were also imported couple of centuries ago from Gujranwala/Sialkot region during Durrani empire times and belonged to the same Mistry/Tarkhan caste due to their engineering skills with wood and metal, they must have been making swords, javelin etc. in those days. I am not sure about this story, it could be wrong but I read somewhere along these lines.