Hello, Dale,

The procedure is described in the Shop Manual.

http://chevy.oldcarmanualproject.com/shop/1948_51truck/51ctsm0110.htm

The "trick" is to obtain the correct thickness of setting-tape (sold by many reproduction parts vendors).

Use gasoline/kerosene/thinner to remove.

Use oil to install (the oil expands the soapstone impregnated "tape").