you will need slightly thicker wire if you rewind down to a 19 turn, if i remember correctly 27turn is 22 guage, 19 is something like 20 guage. also silver solder to resolder to the comm, standard solder will last about 30 seconds to a minute running before it melts, and if you want half decent results make a magnetic balancer to allow you to epoxy balance the comm afterwards, balancing makes a huge difference! try doing an 8 quad wind, 22 guage worked well for me and made a seriously quick 2wd motor!
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