"Bob" wrote in message
oups.com...
I have the good fortune to own and use a Porter Cable 556
biscuit jointer. I would like to use FF biscuits and have
noticed that PC makes a 2" 4-tooth blade with a 7/8"
arbor for the newer model 557 jointer. Has anyone used
the 2" blade on their 556 jointer? I hate to spend
$50 on a blade that won't work.

Note there is more than just a blade change that makes the 557 work. It has
some additional adjustments and stops that are specific to the 2" blade.
Some of these are for safety. I believe it would be unsafe to use the
smaller blade in a machine not designed to use it.

Bob