Kitchen Chair Leg Glide

A stick in the ground marking a repair:

Kitchen chair leg glide
Kitchen chair leg glide

The white plastic glide / slide / foot / cap / whatever is molded around a simple nail that broke a divot out of the foot. Fortunately, I caught it before the nail gouged the kitchen floor.

Under normal conditions, I’d replace the foot from my heap, but, my heap having become somewhat depleted, I swapped in another chair, chipped out the broken plastic, undercut the divot, filled it with JB Kwik epoxy, gooshed the foot in place, and taped it until it cured.

We’ll see how long this lasts …

Road Conditions: Rt 376 Brush Clearing

This might have had something to do with my email and followup from the Dutchess BPAC leader, all with absolutely no feedback:

Overgrowth/Rt 376 SB - cropped overgrowth - 2016-10
Overgrowth/Rt 376 SB – cropped overgrowth – 2016-10

To judge from the shattered stems lining the route, NYSDOT positioned an articulated rotary mower vertically and ran it along the guide rail, cutting the Japanese knotweed more-or-less flush with the rail, then cleaning up most of the debris. Absent glyphosate treatment, the bushes will return in full force next summer.

Even though the disintegrating pavement isn’t any more rideable than before, not having weeds brush our elbows and grab for our eyes makes for a much more comfortable riding experience; now, we’re set for the peak Halloween-to-Groundhog-Day riding season.

As NYSDOT says: “Maintaining roads goes far beyond the edge of the pavement.

Mica Trimmer Capacitors

I picked up two sets of mica trimmer capacitors from eBay:

Mica trimmer capacitors
Mica trimmer capacitors

The big cap on the left goes from a bit under 1000 pF to just over 2500 pF, maybe a 50% range. I got four of the things, they can be disassembled, and I could reduce the total capacitance by maybe half; the tuning range would drop by even more, so it may not be worth it.

The smaller trimmer has different sections: 300-400 pF and 500-700 pF, with about 25% range. As nearly as I can tell, the 700 pF section has one more pair of plates than the 400 pF section.

Given that compression caps work by mashing a stack of mica sheets, I think more pressure makes them more stable and running near the high end of their range will be a Good Thing.

Soldering these New Old Stock relics may be challenging, as the stacked flat metal leads aren’t in pristine condition: properly wetting all the leaves will require plenty of flux.

Resonating the loop antenna requires an external capacitor around 1000 pF. Paralleling a 120 pF fixed cap with both sections of the dual-section cap should do the trick: 900 pF minimum, 1200 pF maximum. Putting the fixed cap on a jumper would reduce the total capacitance, which seems easy & sensible.

Hair Dryer Fuzz

Mary reported that her hair dryer didn’t have nearly as much oomph as in the Good Old Days. After a struggle to remove the rear cover (with no affordance to turn in the direction required to release the hidden latches), this appeared:

Hair dryer inlet fuzz
Hair dryer inlet fuzz

One snort from the shop vacuum returned it to the Good Old Days.

That was easy…

Cropping Images in a PDF

For reasons not relevant here, I had a PDF made from scanned page images with far too much whitespace around the Good Stuff. As with all scanned pages, the margins contain random artifacts that inhibit automagic cropping, so manual intervention was required.

Extract the images as sequentially numbered JPG files:

pdfimages -j mumble.pdf mumble

Experimentally determine how much whitespace to remove, then:

for f in mumble-0??.jpg ; do convert -verbose $f -shave 225x150 ${f%%.*}a.jpg ; done

You could use mogrify to shave the images in-place. However, not modifying the files simplifies the iteration process by always starting with the original images.

Stuff the cropped images back into a PDF:

convert mumble-0??a.jpg mumble-shaved.pdf

Profit!

Scale Cover Repair

You can only drop a small kitchen scale so many times before the plastic cover / weighing tray breaks:

Magnum scale cover - glued and clamped
Magnum scale cover – glued and clamped

The trick was to anchor the cover to the glass plate with the big clamp so that the smaller clamps could exert force straight down on the edge, without flipping the lid due to the bevel. With that all set up: apply IPS #4 to the broken edges, insert pieces, apply clamps, wait overnight.

For the record, my morning mug o’ green tea starts with 4 (-0.0 +0.4) g of leaves…