Stripped bolts on harmonic balancer

[droflex]

1989 Sidekick 1.6L Auto.

I've been trying to replace the water pump.

After reading-up on how to do it someone had said that the bolts holding the harmonic balancer on were 8mm. Not. On this car they are 5mm allen head.

I used a brand new allen head socket attached to a rachet and worked it slow so as not to strip them out.

Out of three bolts (so far) two have striped.

Can someone tell me how to get those stripped bolts out please?



Thanks!