Moving towards the front left are two slots.

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These slots can contain 5 each of the 4" and 2.5" threaded studs. The large holes at the center allow fingers to grasp the studs.
Above and to the left are two rows of small holes in a 1/4" deep groove. These allow storing the small alignment pins that orient the anchor nuts.

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Originally I thought a magnetized SS tool kit could pull them from the holes. NOT SO! They be Stainless Steel. I will likely remove the lip above them to allow finger clearance to grasp them.

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At the far right is a large counter bored hole.

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This stores up to 6 of the Home Depot fender washers and 4 of the 2 3/16" clamp base washers. I need to add a counter bore at the bottom so the SS tool kit can snag the last washer at the bottom of the hole.

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Now everything in it's place.

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How can all this stay 'in the holes'?

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Covering it will help, but how to attach the cover.

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Attach it with a hinge at both ends. The hinges are two narrow strips with a counter sink hole at each end.

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In each hole a flat head screw and a flat washer attach to both the cover and the 'base'. In order to function effectively the hinge holes are not simply a counter sunk hole. The hole under the counter sink is sized to tightly clear the od of the unthreaded shank of the flat head screw. Today's flat head screws have a larger od of the threads than the plain shank under the head of the screws. This means the screws must be screwed through the hinge hole until the unthreaded shank can act as a pivot. Both the countersnk And the washer side of the hinge are coated with JPW as well as the unthreaded shank.
So with the cover opened.

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And fully open and laying flat.

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And closed.

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We are not yet finished. The cover needs to be secured to the base with some sort of latch. They are supposedly 'in the mail'.
More to come.
Latches arrived.

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I originally planned to attach a latch at the front sides of both ends. BUT the hinges require that real estate to function.(it is the simple, obvious stuff that in the end bites thee!) So mount in the front. BUT then they prevent a full opened cover. So bury them in a groove.
But then the cover will not lay flat in the full open position.

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The protrusion of the upper latch is in the way.
So What! The least of the evils.
BUT what if the latch parts are reversed?

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Thank God for toothpick hole fillers.
I asked Dennis a while back as I was contemplating making this about any new 'stuff' coming out. His reply was "make it modular".
So:

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That is it until something new appears.
Now about my favorite "knob".

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From Woodpeckers. Accepts either a 1/4 nut or a 1/4 hex head bolt. Removable and reusable.

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An unusual variation. There IS a nut inside also.
(I'se testing the former 10 pix/post limit - not sure there is one any more)