Assuming you mean stocks for holding feet and/or hands.
There are many good tips in the message archives of the ticklepalace group on yahoo. Searching for "stocks" yields 402 hits! If you can't find all the information you need, you could try posting your questions to that group. Failing that try emailing the moderator of that group, Kujman, who's somewhat of an expert on it.
You can also look for "http://www.ropejock.com" via www.archive.org's wayback. The site, by Jack, used to have a page of tips for building a stock table, along with pictures. Here's a direct link, but beware that this link might not work if archive.org changes their structure.