I'm getting ready to add another VM120 chuck to my collection and just realized there is a direct thready option for these chucks that do not require an insert adapter. Can anyone shed some light on the pros and cons of going with the direct thread chuck vs. using the insert adapter. I turn on a PM3520 now, any other lathe I would ever go to would have the same 1-1/4 x 8 spindle size so I'm not worried about being able to change thread size for a new lathe if that ever happened.