It comes with a 3/16 x 6 inch screwdriver (at least that's what the
one that came with mine measures)--if you've lost that you'll need to
find one like it. There's a hole on the top of the handle in
front--put the screwdriver in that hole and unscrew the screw until
the blade comes loose enough to twist 90 degrees and come out, then
when you put the new blade in you reverse the process and tighten the
1581 is still listed in the current catalog. If yours uses a button
then I'd bet that it's a 1584 or 1587.
Incidentally there's an IPB at
and the last item on the list is the special screwdriver, which you
can order for $4.50 and shipping, but it's a special order item which
they say takes 2 weeks.
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