I welded 2 of my cranks so far.Ill email a friend i know that just did his and see if he wants to tackle it.Ill have him get in touch with ya or ill get back.Look up echo left hand threads in this forum.Av8tor did a left hand crank conversion where he drilled out the crankshaft and left a very detailed instructions that you could follow.If you have the equipment.If not let me know and i could do it.