Can anyone explain a good technique for installing this plumb / level - newbie here using for mailbox post and would like to do straight.

Start it by using the bar with your hands equally spaced on each side of it with even, steady downward pressure. Once it is started well into the ground, you should be able to use the bar off to one side for more leverage. Once I had it to ground level, I installed the post, used a large pipe wrench to turn it even deeper. Installed a plastic mail box kit that covers the post.

Can this be used on 2 x 4” post?

It's made for a 4 x 4, but you could usea 2 x 4 and screw it to one side of the anchor.

Would these work in loose sand if there was not much stress put on them? We want to mark off a beach lot.

There is no problem with using these in sand.

Will this work for a 40" tall x 96" long panels cedar picket fence and gates.

I agree, it would work. Sounds like you are only talking 2 maybe 3 posts, or 4 posts with gate, so this would be OK. Alternatively, one cheap bag of premix concrete per every two posts will also do the trick and easier to make plumb.

Mayne 580d Bk Ground Screw Silver 4x3 | Desertcart Cote D' Ivoire

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Sold byAmazon Cote D' IvoireDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🔧 Ground your projects with confidence!

GLOBAL REACH - International product with unique specifications for diverse needs.
STURDY SUPPORT - Accommodates standard 4x4 wood posts for versatile applications.
EASY INSTALLATION - Includes 20" rebar and 5 lag bolts for a hassle-free setup.
WEATHER RESISTANT - Constructed from galvanized steel to withstand the elements.
OPTIMAL PERFORMANCE - Designed for standard soil conditions, ensuring stability.

The Mayne580D-BK Ground Screw is a robust solution for securing 4x4 wood posts, featuring durable galvanized steel construction and an easy installation process with included lag bolts and rebar. Ideal for standard soil conditions, this product ensures your outdoor projects stand the test of time.

Specifications

Product Dimensions	7.62 x 8.89 x 68.58 cm; 2.56 kg
Part number	580D
Item display height	27 inches
Item display length	3 inches
Item display width	3.5 inches
Item display weight	2.72 kg
Material type	Galvanized steel
Manufacturer	Mayne
Item model number	580D-BK
ASIN	B00191RWKA

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