Try Springfield Sporters they have a good selection of Enfield
parts.
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a screw and wedges are types of simples machines - are actually modified inclined planes....
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there are 2.5 million screws.
not screws - rivets
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A magnet will pick up the iron screws but not the brass.
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Tek screws are a name brand type of self drilling screws. They
can also be called drill bit screws and self tapping screws.
Phillips and other companies manufacture these as well.