[QUOTE] Second son has bought an exotic ([URL="http://www.staticbikes.co.uk"]www.staticbikes.co.uk[/URL]) jump bicycle frame but it has 14mm dropouts and he has 9mm axles. He needs a couple of washers about 4mm thick (exact size to be confirmed) with a hole diameter of 9mm and an outside diameter of 14mm. Any (helpfuy/relevant) suggestions welcome[/QUOTE] I did just have another thought... ....you mentioned your lad had a rear wheel built up on a Hope hub. Have you spoken to Hope? I reckon they'd possible make a one-off axle or adaptor for it.