Fixing Murloc model

[Hermit]

I edited the Mur'gul slave model to look like Reign of Chaos Murloc. I deleted the little spikes that were on its back and copied the flipper thing from a RoC Murloc. It doesn't look good because the flipper doesn't follow and doesn't bend with the spine, like it should. I tried to attach vertices to bones in Mdlvis, but whenever I press "Attach vertices to bone", it crashes instantly. So, if anyone could attach the flipper thingy to the spine I would be very grateful.

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[Himperion]

Hello, the flipper was attached to the chest bone, you want the head and ass bone too?

 

[Hermit]

Well the end is still a bit off, but +rep for helping me.