Version 2 apparently does not have a back door that closes to secure washer and bit. That is fine but improvement is needed if this is the case. The ridges the box should then be made the same width is the washer. It is less than the width of the washer. This means it is not as secure and not as easy to secure everything.
Ridges for washer are not very pronounced and adds to the insecurity.
Also, the measurement between the washer space should be provided by a sticker. Customer can then use shorter bits and just lower the z by that amount to get the same result as the longer bits. No back door, insufficient ridges, width of spacer not matching width of box calls for a 3 needing improvement all day long. I will have to get the measurements myself since none are provided.
I just think for the price the plastic could be shaped a little better to fit the washer for a secure fit. It was too easy to accidentally slant the washer while tightening the collar.