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
RC ROCKET PLANE
In 1980, the sub-Commission on the rocket modeling of the FAI decided to introduce a new class of raketoplana S8E with a maximum mass up to 300 g engine with a total impulse of 40 n*S....
EXPRESS REPAIR CHAIR
The main defect of Seating that occurs during its operation, the loosening of the legs. The design of some of the chairs doesn't allow to fix them at home without disturbing the...
