Hillside56

Hillside52 adds two lower pinkie keys per side. Possible uses of them are return, hyper, esc and arrow keys. Essentially the same as ortho boards make of the outer parts of their lower row.

It also adds a very low profile bottom plate and a spot in the outer columns for a magnet to anchor a bit above a laptop keyboard.

Lower Plate Hardware

The lower plate is an extra PCB that is attached with inserts and screws.

Part	Type	Count	US Shops	Cost
Zero height threaded inserts	Keystone 4929 2-56	10	Mouser, Digi-Key	$5
Screw	2-56 x 1/8 steel	10	McMasterCarr	$5
Hex Key	5/64	1	McMasterCarr	$1
Bump-ons	SJ5076, SJ5302, SJ5402

The 'zero' height inserts actually have height 0.3 mm below the board.

A ball-end key would be nicer McMasterCarr

Magnets for Laptop

Macbooks have magnets to the side of the keyboard that could help anchor the Hillside keyboard in place. The PCB has a 1/4" cutout at the base of the pinkie keys for inserting a matching magnet. The magnet is held in place between the base plate and the base of the pinkie key.

Part	Type	Count	US Shops	Cost
Disk magnet	1/4 x 1/16	2	McMasterCarr, Digi-Key	$2

The McMasterCar magnet has a strength of 14,800 G and a pull of 1.4 lb, while the Digi-Key is 2,568 G.