Wats the best way to get the battery strap bolt out on a mk1 focus, the bolt is threaded so it just keeps spinning when loosing it but it's not coming out, is possible to cut the strap and and the battery tray is bolted down and can just be replaced with one from a scrapyard

 

Cut the strap, remove battery, then can unbolt the tray..just hope you get one that isn't fooked! Lots are!