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Hello kabayan.
If I were you tinkering for the first time I would definitely keep the fuse. Buy one from cantire or princess auto and replace that blown fuse put wires together. Since this is an ICS m4 pop out the upper gearbox. Adjust motor height all the way down. put battery in, put selector to semi auto. Now with the top portion of the gearbox separated pull the trigger once then adjust motor height up 1 turn at a time until you see the gears turn. I do the motor height by sound and its up to you to find that sweet spot. Motor sound would be from silent until it gets noisy like a gear trying to turn while theres a wrench inside the gearbox (bad). When i get to that spot where the noise level changes i back it out a bit like a quarter turn of the allen key.
The good thing about ICS is that you can actually set your motor height without load from the spring which is good for first time tinkerers.
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