May be in over my head trying to sleeve an insert i guess its called. Have cheaper 5/8"insert material i have been buying online, i have been drilling it on my lathe by placing it in my 5/8 collet chuck. Cant seem to get it exact center though, is this the correct way to drill an insert? I put it in my flat jig trying to compensate for the off center hole but cant never get it cut right. Thoughts and advice? Thanks guys.