Originally Posted by
jchibante
Use tamperproof bolts and fill the opening with super glue. A little expensive because you need to buy a specialized screw and bit, but probably the best deterrent to the average thief. A professional might carry specialty bits with him and the superglue will then slow him down a little. You could still even use a chain as well.
Something like this:
http://www.oemhardware.ca/oempdf/GENERIC.pdf
Probably about a $10-20 investment on ebay for a bit and about 10-20 bolts.
You probably don't even need to use special tamper-proof bolts. Just use something weird from here:
http://en.wikipedia.org/wiki/Screw_drive
How many people carry around weird screw types like tri-wing or security torx? Heck, if you're not in Canada, you could probably even just use a Robertson bolt.
Although if you don't mind never adjusting you saddle, use a one-way bolt
