BH65 hoe with factory 16" bucket and mechanical thumb. The thumb is very hard to move must hook a chain to bucket and wrap around the thumb to open. Must close by curling the bucket into the thumb. Want to be able to move the thumb with my own arms. Nothing appears bent. soaked in pb blaster. Thinking I may have to pound out the pins and polish them. Is there a better way than sledgehammering them till they come out? I dont have any welding tanks for heating. Would that new MAP Gas work. thanks for any ideas.