Anyone know anything about bolens weedeaters? How do you take the head off?

See if there is a small hole in the shaft area to insert a pin to hold while you turn the nut to remove the head. Some are left handed threads.

Thank you. Mike

I put new line on my weedeater but I can't get it started. I took out the spark plug and cleaned it, but I don't know what the gas adjustment should be with the small screw hole on the back of the trimmer. I have a model bl-150 Thanks, Nick