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And over the past few years there has been a huge

proliferation 增殖 of screw heads. As you can see in the
photo there are many screw heads that come with

this power screwdriver. Sometimes it can be quite

difficult trying to match the screw head to the actual
screw. Very often the differences are very small.

If you select the wrong screw head you can so easily
damage the screw resulting in it being stuck. When

this happens it's necessary to drill out the screw which

leaves permanent damage. So a little care and
attention is required to ensure the perfect match.

One of the problems with a power screwdriver relates
to it running out of charge before the job is finished.

As you see in the photo there is a charger in the kit

box, however if you don't use the screwdriver the
charge leaks out. So you have to remember to charge

it up every couple of weeks.

This completes Lesson 48

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