Xref: kermit rec.gardens.edible:67757

We used soft drink bottles. Remove the cap, cut the top off and
invert it into the lower portion of the bottle. The top then becomes
more or less a funnel to hold the seed in position. Fill the bottle
with water, enough to cover the bottom 1/2 to 1/3 of the seed. Refill
as needed. Yes the seed will split, but still be supported by the
neck of the bottle. When it is grown enough to plant, the bottle can
be cut off using a strong pair of scissors. The bottles with wider
caps, may allow the root to be lifted through the opening without
damaging the root.

Thats a good idea,
Need to go out and buy some softdrink bottles it may work with
Thanks,
Steve