cold seat removal in Symmons temptrol

[jasperjohns]

My Symmons temptroll shower is leaking like a sieve. I did not want to pay the $300 the plumber will charge so I am DIMyself. problem is i can not remove the old cold seat (part no. TA-4). this item is so snug that i am stripping it when i try to remove it. The hot seat was easy.... Any sugestions on how to remove cold seat??