My eldest son (8) has a Beinn 24" and in six months or less will be moving up to a 26" wheel (probably Beinn 26") as he is so tall. He is currently doing his Bikeability training and is having real problems doing hand signals and looking over his shoulder as the bike tends towards a racing stance (i.e. slightly bent over the frame) compared with his peers who have more 'sit up and beg' bikes. Is there a temporary means of adjusting or changing the stem, or is there something like a an ahead extension or the like which would temporarily solve the problem with regards to handlebar height? The handlebars are set at their highest point at the moment.