For example، we know that the number of liner is different from the tricone bit، but doesn't it cause problems for the piece when attached between pipe and tricone؟
milling is an depend on the wireline/slick-line cut if it is not puffed then overshot according to size can catch packed with Pop (it is may vary) next cleaning the casing with scrapper and if require stabiliser and so many more different jobs can do at workover rig according to oil well and operator company requirement