Here are my thoughts on making a plane adjust hammer.
   I am experimenting.

Wooden planes are a problem. They always were.
Sometimes you have to hit them pretty hard to get them to loosen up...
and now its dangerous.
  Like you want to leave hammer marks in a plane from 1779??? hah

I have found med hard rubber........... Not the hardest, but not squishy 
either,
can deliver a wallop, and you would never know it from looking.
The worst you are ever going to do is burnish it a teensy bit.

   Wedges you still have to be super careful of course.
You can't afford to give a wooden plane wedge a dirty 
look................ lol.
Anything will hurt a wedge.
But something soft enough not to wreck it easily, would be nice.

Even the blades are sensitive. Don't want to be forming a big ol 
mushroom on the blade from hammering with steel.
Better to waste the mallet than the blades, I think.
Sacrificial brass seems good.   It'll deform and mushroom easy, but oh 
lah de dah.
Better the mallet suffers

So here I am so far.
Rubber and brass. It weighs in at about 14oz.
  Its 8" long

BTW its all Ron Harper's fault. He got me going on an old idea I had 
long ago.

I am still not sure this is the totally right thing,
but it'll do until the right thing comes along hahahahaha

Next one will be better

http://users.snowcrest.net/kitty/sgrandstaff/images/hometools/malletplane.JPG

yours scott

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*******************************
    Scott Grandstaff
    Box 409 Happy Camp, Ca  96039
    scottg@s...
    http://www.snowcrest.net/kitty/sgrandstaff/
    http://www.snowcrest.net/kitty/hpages/index.html