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ok so i want to make a hi rise seat. when it mounts to the tunnel is it wood under the seat or plastic. how do i get it off and if i buy seat foam that is taller and reapolster it to make it a high rise seat. so i am sitting higher iam a big guy i put the bar risers on today. 3 1/2 inches and they lines and cables barly fit. i need a simple idea to convince my dad he is scared to deth that i will mess it up so and idea or pics that you have done would be nice. if i want to make it shorter can i cut the wood/plastic and have it shorter? thanx