Can't remove freehub - help

solarflash

I have a bikehubstore hub laced onto pacenti sl23 for commuting. The freehub needed replaced so I have a spare now but now can't get the bloody old one off. It looks to use a 5mm and 10mm allen keys but no amount of torque will get the second end cap off. Anyone got any advice?

ugo.santalucia

Sometimes they are stuck, they are also pretty fragile alloy parts, so not good fun. Is this one of those non flanged axles that you can slide off? If so you should be able to remove the freehub from the axle the other side