Also, if you can find them, those really string plastic ties aren't that bad an idea either... I've used them in seats that duct taping was little hard to accomplish...
That being said duct tape works just fine, but gaffer's tape (it's expensive, sometimes you can get it on sale on GC or other places) is really secure and also comes off a lot easier than duct tape. The expense + difficulty to find make gaf tape a little impractical, but if you can swing it, it works great.