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Screwdrivers and an iron stick? Don't care much for your paint? Try inflatable wedges. http://www.thefirestore.com/mobile/store/product.aspx/productId/12190/Steck-Inflatable-Easy-Wedge/
Hi, I have been a unicycler for over 40 years.If this advice works for you then use it.HOWEVER, it is very hard to learn how to ride a unicycle that has low tire pressure as seen in the photos. Get it up to 60 psi for the fastest response. Otherwise, your cycle will be sluggish and learning will be frustrating.