have you ever watched anyone change a blade? If not its very simple. They sell glue sticks for this sort of thing you can visit you local hockey shop to pick one up or I just use a glue stick from a hot glue gun. Any way you heat up the shaft (at the bottom were the blade is going in) you also melt the glue and place it on the hostel you then insert the blade into the shaft and push them together it may require a little force / banging on the floor and more heat. If you don't know what your doing which it seems like you don't i would use a heat gun, but it can be done over an open flame. I use the stove top. If you buy a blade from a local shop and bring the shaft with you they should offer to put it in for you. Hope this helps
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