!!! UPDATED: Version 1 uses 10-32 bolts. Version 2 uses 1/4-20 bolts !!!
Planer Blade Sharpening Jig for 2 blades at 40 degree bevel / edge. Printed parts are the base and shoe. Requires 5 bolts, washers, and wingnuts. Heads of bolts are seated in the base of the shoe, and run up through the base to washer and wingnut at the top. Light finger tight should do it. Specifically designed for Delta 22-547 blades, but will serve for any number of blades requiring a 40 degree top bevel angle. Length 9.69" (246 mm), width 1.77" (45 mm), width of blade tip to blade tip: 1.7" (43.26 mm), height with blades (not including bolts) 1 1/16" (~27 mm).

Can sharpen with sandpaper laid on flat surface plate (such as granite or plate glass), a large stone (such as a Norton IM-313), or smaller hone "floated" over the edges (try inverting the jig). Easy does it!

Version 1 Bolts: 10-32 thread, 1 1/4" long, 5/16" head width, 1/8" head height.
Version 2 Bolts: 1/4-20 thread, 1/14" long, 7/16" head width, 5/32" head height
Norton IM-313: https://www.nortonabrasives.com/en-us/norton-im313-multi-oilstone-sharpening-system

Notes for use: Overtightening wingnuts can impart a bend in the jig. Take care to seat blades flat in the base, edges even against the back corner of their pocket. When tightening the wingnuts, bring them to just a very gentle snug. Place the jig with blades on your sharpening surface. Ease the wingnuts and ensure both blades are evenly flat on your surface, and jig body settled down with no rocking or bend detected. Snug wingnuts just to touch washers all around, check all is seated and flat, snug only a teeny bit more (blades will not fall out) evenly and checking all is flat. If a bend occures, loosen nuts and snug again a little less. This procedure worked for me with some very ugly old used blades.