I agree that the screw adjustment on some harrows can be a pain when they get some age on them without routine maintenance such as cleaning and greasing.
We believe that the required maintenance is outweighed by the painless adjustment process.
I'll give you a little background on the screw adjustment that we use on our
Standard Category 1 and
Heavier Deluxe Box Frame harrows that feature both a Cat 1 and 2 hitch.
For the first models we produced, we purchased about 6 sets of the screw adjustment kits from Leinbach. We even inquired with Speeco about purchasing a large quantity of these for our harrows but they were no longer offered by them.
After analyzing these kits, Ted decided to enhance the durability by making our own adjustment kits rather than importing the cheap kits made out of soft metal from you know where!!
Currently, we make our screw adjustment kits from Grade 8 threaded rods and bend our own handles in our facility.
With regular upkeep, they should last many years and take more of a beating than any other screw type harrow adjustment being used.
If your rod does get damaged or rusts, you can just purchase a threaded rod and easily replace it.
We also route our rod through the box frame to keep it lined up better in the long run.
You will also notice that we do not pierce the box frame which greatly adds to the durability.
Our tubes are capped off by a piece of steel rather than leaving them open or using plastic caps.
The components of our harrows are cut with a laser so everything is precise and lines up perfectly.
These are just a few of the features that adds to the value of our harrows and will make them last for generations.
I hope this helps.
Travis