spanner wrench is preferred on the adjustr, but a hammer and flat head work in a pinch...
Sure, there are aftermarket seats for anything, but you do not need one. Get some stomp grip or tech spec type friction pads and use your knees to keep you put.
The bars are easy and cheap to replace...
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"I have a knife!" -my 3 year old.
"Step off me or I'll hit you with a bat"- same kid
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