Denon DA 307 and DA 309

the DA 401 is an arm dedicated to light cartridges therefore only moving magnet.

How much does your DA 307 swing?

I did a test after taking it to the laboratory for a review, this and all that can fluctuate .... it seems to me to be a bit a little but not is possible improve.
I would like confirmation if your DA 307 also oscillates so little.

https://www.youtube.com/watch?v=F42OYnqevoc

the DA 401 is an arm dedicated to light cartridges therefore only moving magnet.

No, look at this Denon catalog, this is DA-401 tonearm with MC cartridge DL-303

This tonearm goes with two different counterweights for MM or MC and can be used with both types of cartridges.

Here you will find it with classic DL-103 series (higher compliance version for sure). 

This tonearm goes with two different counterweights for MM or MC and can be used with both types of cartridges.

better this way

I would like confirmation if your DA 307 also oscillates so little.

Not my case, mine oscillates more than the one in the video, go to my link and watch the video https://www.dropbox.com/sh/m6j01m72nt9v5tl/AADVZPzl_uly7MJldNR_nT9la?dl=0