So i am looking at getting some form of convertible guys to use a railed seat on a pivotal post. However... Some seem to require you drill a hole through the top of your seat to use a bolt like a standard pivotal set up.. However Odyssey guys seem to use a bolt like you would use on a hub. So do you have to try & get a spanner in through the underside of the seat or what? I'm confuzzeled! Can someone explain to me exactly how you use theses things? In particular the Odyssey ones please.
Cheers Guys, Stay Cool.