damaged crankset endcap help

[encephalopathy]

i've managed to overtighten the crankset encap on my FSA crankset on the MTB and round the allen key socket. the cranks still turn ok but are stiffer than they should be when i back pedal. any ideas how i get this endcap off again as i wont be able to undo the cranks to change the crankset if i decide to replace it?

any (belated) suggestions for a reasonably priced torque wrench tool so i won't be an overtightening numptie again?

thanks

 

[encephalopathy]

well finally got round to fixing this
secret to removing it is to loosen the crankarm pinchbolts first......
i then liberally wd40'd it left it and 20 mins later hammered in an allen key and removed it fairly easily.

a good day today as i managed to also fix my continually rising KS supernatural dropper post by simply unscrewing the seatpost collar and releasing built up air inside. it now stays at the level i wish