Bike pedals used to put a metal screw cap to protect the bearings from contamination. Now, instead, use the plastic plugs, which are often lost. Rescue plastic or nylon tubes from medical bubbles. Such substitutes being kept quite steady.
Recommend to read
Mini tractor: from design to plowing
"Manual labor — to the shoulders of machines!" — under this headline, materials from the All-Union Conference of VISKHOM named after V. P. Goryachkin were published in our magazine (see...
MODEL ROCKET PLANE WITH BOOSTER
This publication, we continue the story about the history of one of the categories in the rocket modeling - S4. It includes four classes of models raketoplana (model glider with the...
