Hi. I was doing some viewing photography last night and when adjusting the Altitude while trying to align i noticed the rear Alt adjustment was quite stiff. When i went to pack up and bring the Alt down it had totally seized. This morning i took the mount off the tripod and discovered the rear Alt adjustment bolt had moved off the part the raises Alt. I think the bot is even bent

The bolt is seized because of the bend thread and cant removed it.
Can someone please tell me what is the best way to pull apart mount to access bolt etc?
Or has this mount now become a paper weight

Thanks for any help and advise.
Steve.
EDIT- I just moved the Alt back to 90deg to get clear view of the bolt. It is bent and the last 5 or so threads are mashed. I think i need to hacksaw the bolt head off and remove from the inside?