k_classify_objects

Tip: in my wall-mounted storage system, top shelves are light-duty, so fewer screws needed (one per metal arm).

* Screwing is much easier than drilling, but once you break a screw (or gets the recess worn out completely), it becomes harder than drilling.
* Screwing on wood is easier than screwing on concrete with a wall plug (assuming the hole is available). Main problem with wood is cost. Some wood pieces are expensive and easily damaged.

— screw-in too tight .. I had multiple setbacks when I drive a screw too hard, later unable to take it out.
* sometimes rust would become a blocker
* sometimes the recess gets stripped
* Sometimes the screw head gets twisted off! This has happened on wood, concrete, aluminum …

Tip: I now prefer big screw head with big recess, that are easy to catch with big screw drivers.
Tip: for small screw heads, let us drive in lightly
Tip: new screw drivers have sharper tips and can catch the recess better

Wood is easier than concrete but sometimes I could hear the screeching sound in the last turns. That seems to suggest the friction is now extreme. Afterwards, I sometimes had difficulty removing the screw

https://www.familyhandyman.com/list/how-to-drive-screws-perfectly has many screwing tips, mostly about wood screwing.

While removing a basin bracket in #1173, I was able to drill in right beside the stuck screw, to loosen it… managed to extract it after a few minutes. The hole became 1.5 times wider. I think can be covered easily. Initially, need to use no-hammer mode to create a small dent beside the stuck screw.

— rust
tip: most stainless steel screws (best rust-resistance) are non-magnetic.
Tip: black screws are not always rust-resistant.

— hole becomes too loose/big [1]

• sugg: match sticks are better than toothpick or splinter, according to some people
• sugg: cable tie
• sugg: plastic wall plug .. can be used for wood
• sugg: use bigger screw.. easy but make the hole even bigger
• sugg: wood_glue?
• sugg: hardwood_plug designed for MDF or particleboard? Couldn’t find

sugg: For wood, a thin plug can fill an oversized hole, as an alternative to a thicker screw, which tends to push on the wood (hard) and widen the hole even further 🙁 A plug does the same, but with less damage.

======== classifying screws (tcost!) .. I have classified by 1) thickness 2) magnetism.
— [1] classify screws by thickness… Once I unscrew a thick screw from wood/concrete, a thin screw would not provide enough /grip/. The hole is now too wide so I need an even thicker screw. (Analog: vigina)

Proven best practice: if too many screw types, classify them by thickness.

— nut-n-bolt .. Key principle is compatibility. Thickness is not the only criteria, so naked eye isn’t reliable; testing required.  Two components are incompatible if the nut can’t screw easily on the bolt, even if thichness match.

Scheme 1: group by compatibility

Scheme 2: keep original packaging which guarantees compatibility. Good IFF

• not bulky or hard to /access/.
• a single compatible group in original package.