Thanks for the replies folks
I'm hoping a future release will have a 'search this forum' function which is easier to see, but for now another way to do it is to go to the forum in question (Basses for sale) and then click the search box, and select 'this forum only', and 'search titles only'
Let me know if you want me to set up a specific search for you then paste the link here - you can then save that search to your own custom 'stream'
Cheers
Chris
P.S here's an example I set up for Vigier Arpege basses. You can change the term for what you're after
https://www.basschat.co.uk/search/?q=vigier arpege&type=forums_topic&nodes=19&updated_after=any&sortby=newest&search_in=titles&search_and_or=and