Have done

1 / I bought here is 2 months has ca 71.90 and today it is 49.00 euros a nearly 40% reduction.

2 / it is not standard to mount any kind of follow focus connector that has the holes before too distant from each other and not standard.

3 / It's better not to use Pro case (heavy) as at the nuts is not very stable (though for small housings enter range that are less than 1 kg) but if you add a long focal length is ca started moving pretty good.