12 people and 2 stakes? Bad planning.
You can also use a piece of hard maple. Cut the grooves and sand it
to round off. I take a block, drill a series of large holes of
graduated size, cut the block in half lengthwise to get a half round
groove. I think there was a picture of a stake like this in a past
issue of Lapidary Journal article on Anticlastic Raising by Heiki
Sepa. Check the archives. Works well. I like it better than a delrin
stake. The better choice is a steel stake and delrin hammers. Delrin
blocks large enough for stakes are not inexpensive.
Where are you located? Contact me off list. I make stakes as I need