Although there was an uneasy aspect of adsorption power, all the work was finished with only one, and it is still possible to use it for a while. Once it adsorbs properly, it will not peel off if you use the bulb as a center after modifying it by hand. When peeling off, repeat wiping as the compound replacement time. I used a ballpoint pen and used a stick. The sticks are lighter but not tiring. It is a feeling of hitting the table with your fingers.
The octopus bought at a certain tool mass retailer did not attach to the valve well for the sucker. Therefore, it was necessary to reattach the suction cup many times and work did not proceed. After purchasing and repairing this product, it became unnecessary to reattach the sucker on the way and it became possible to concentrate on the rubbing of the valve.