It depends. If you drop your iPod, the hard case will protect the iPod. Unlike the hard case, silicone cases are much smoother.
yes
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Depends but usually 3 or 4 kgs plus the guitar.
Replacing any tractor part can be difficult if you don't know what you are doing. If you have a general knowledge of the equipment and have done work on it in the past then it shouldn't be overly...