I have found that on the head stock of my 10" Atlas the index pin cannot be engaged with the large gear. They do not line up. About half a hole off. The gear has 10-241 cast in it so seems to be correct. Also the back gear does not engage right, it meshes with the big gear before the smaller gear. I can shim it back but it then will not mesh fully with the small gear. I have looked at many times trying to understand what I should do. I feel stupid asking but don't know where to go from here. I have been a millwright in a saw mill and worked with quite a few lathes but this has me stumped.