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Neil, the threaded inserts or star nuts are available in a few sizes, depending on the inside diameter of your tube. You can search on eBay for star nuts.
Bicycle shops also sell them (but double the price) as they are used in the steerer tube on bike forks.
Make sure they are not too small, they should in fact match the OD of the tube and then they will be a good fit inside the tube.
A cheaper alternative I have seen on some DIY stuff has been a short piece of tas oak dowel araldited into each end of the strut and then screws used instead of machine screws.
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