Setting up transmission as the torrent client in Chrome

I use Chrome Version 55.0.2883.87 (64-bit).
 When I click a torrent link, it opens xdg-open dialog window and do nothing.
If there is transmission-gtk.desktop file /usr/share/applications/transmission-gtk.desktop, run the following command.

$  xdg-mime default transmission-gtk.desktop x-scheme-handler/magnet

Restart Chrome.


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Repaired a broken old woofer

A pair of Chario RF-100 bookshelf speaker is twenty some years old. One speaker’s woofer developed internal damage, tore the rubber down.




I repaired the woofer using 3D printed support.

3D model and instruction

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Imperfection of 3D printing ABS filament

How to prevent the slack of inclined side?

Filament: eSun ABS
Printing temperature: 255C


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Riding R1 on the edge

Since March 2018, I’ve been practicing high-speed cornering on famous winding roads with sportbike warriors. I just started to drag knee on the pavement one week ago.

It’s very dangerous and I’ve stopped counting motorcycle accidents.

April 19, 2018
BandPhoto_2018_05_04_19_01_00 (1)

June 13, 2018


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Faulty start problem of cold engine

I have been riding a 2006 Yamaha R1. It never had an engine problem for 12 years.

The R1 developed cold start problem around middle of March 2018. The symtom is when the engine is cold in ambient temperature, it fails to start the engine with own battery.  Jump start using a big car battery is required.  Once the engine starts, run about 10 to 15 minutes at idle, ignition is fine.

The mechanic at the bike shop told me replacement of three year old battery would fix it. So I replaced the old battery with new one. But new battery failed to start the engine also. Every time I went to a tour, I did jump start the R1 and have managed bike riding.

If the battery voltage is low, charging voltage drops below 14 V on the battery terminals.  The mechanic seemed not to understand it and suggested to replace the regulator. I could do that if the engine went dead while I was riding.  Genuine regulator from Yamaha is 340,000 KRW which is not cheap!

I asked to the mechanic what if new regulator wouldn’t fix the problem. His answer was to replace the generator next, which would cost probably over 400,000 KRW. In my head ‘then what’s next?’ I’ve known the mechanic for six years and did not want to develop bad relationship.

Few days ago I brought the R1 to a local bike center which a rider fixed his bike. The shop was small and owner has worked as a mechanic over three decades. We discussed about possible cause of the ignition problem of cold engine.

  • Valve clearance is out of the specification
  • Faulty starter motor
  • Faulty relay of starter motor
  • Generator or regulator unlikely

The mechanic suspected the starter motor and he would replace it with new one.   New starter motor and replacement of the starter motor relay fixed the cold ignition problem. The day before yesterday I went to the shop and picked up the R1. The mileage was 43,530 km.

I disassembled it to look inside. The inside was covered with black liquid. There was a broken piece of magnet.







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Pipe cloth hanger



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Convert a JPEG image to STL file

Start the Inkscape (0.92)

Select [File > Open] menu

Choose a JPEG image file and click.

On the pop-up window, choose the following values:

Image Import Type: Embed

Image DPI: From file

Image Rendering Mode: None

After the image is loaded, choose [Path > Trace Bitmap] menu

On the pop-up window, set Threshold to 0.5. Then press OK.

It will create a black trace on top of the image.

Select the black trace and choose [File > Save as] menu.

Type the file name, choose OpenSCAD DXF Output in the drop-down list.

Copy the dxf file to an OpenSCAD’s working directory.

Create a SCAD file and use linear_extrude() to load the DXF file.

linear_extrude(height = 3, center = true, convexity = 10)
import(file = "cloud3-logo-test.dxf");

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