What I found on my jack is that the screws adjust the level.
I put a bulls eye level in my freezer, got it level then adjusted the jack level.
It sure makes it easier to level the trailer.
PS I will go look at my screws.
PSS I appear to have got lucky as my jack already has stainless screws.
Originally Posted by Michael Pupeza
Many of the add-on electric tongue jacks have a little Bubble Level, installed with three small Phillips screws, covering the Auxiliary (Emergency) access for the manual crank for that jack, and the existing screws start to rust the day you install it. In addition, the bubble doesn't match the real 'level' of the trailer.
Unfortunately, that item is needed to keep water from coming into the gears, so little washers may let water in.
Here's my answer:
Get longer stainless or brass screws and cut a piece of closed cell foam (wet suit neoprene or backpacker foam or similar) and cut a circle to fit.
Since it is flexible foam, you can adjust the screws so that the bubble actually shows the exact LEVEL balance of the trailer!
Neat. and it now does useful job, other than keeping water out of the gears!
We keep improving!