Thanks all! Yes, I'm talking about a cheap computer, but I had them stolen before - purely by malice, I guess, not for profit. And I don't lose sleep over this either...
I made a bracket that requires either unscrewing a complicated arrangement or destroying the computer to get it off. With this, I have not taken the computer off the bike for several years. The bike stands outside during the day in a busy area. Still, of course, the areas vary.
Could you please post any pics of it, or explain how you made it?