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Trying to screw the screws into the head (which is hardwood) has been difficult, the screwhead (the drives) have been damaged and do not turn well any more with the screwdriver. This is mostly my fault for not properly drilling holes initially, though is also a reflection of the quality of the screw. The tuners themselves seem okay, fine for the price paid.
These machine heads are cheap, the inside of them is plastic. They also did not fit my strat,as the screw hole did not line up with the original hole.However I give them 3 stars because I used the screws and washers to replace the old ones. If you are looking for quality machine heads save up and buy a more expensive set.