How about an alternative suggestion?

Take "tupperware" containers that are of the
size you need. Like a square or rectangle
container you would store sandwiches in, or
cookies in. Or an upside down cake carrier.

Fill the bottom with melted paraffin (say, 1/2 thick
or more). Allow to solidify.

You can then pin the specimen to the wax,
pour your fixative over the specimen and wax,
put the lid back on the container, and allow
to fix. Dump out fixative when done.

Nice thing about this is -

- Reuseable for years

- Washable (cold, not hot water. Don't
want to melt the wax)

- Stackable, so don't take up too much space

- With lid firmly fastened, little
exposure to fixative.

- Don't have to worry about storing
cork soaked with fixative, or disposing
of cork soaked with fixative.

- If and when the wax becomes too 
chewed up due to pins, remove the wax,
pour in new paraffin, and you have a
new clean base.

- Cheap to replace when you decide
to go with a different color or
design years from now. Basically,
these don't wear out, so they are
good for years. 

Just a thought.

Peggy A. Wenk, HTL(ASCP)
William Beaumont Hospital
Royal Oak, MI