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Balancing knives. By the way, you can find out how to make them and how to use them. But in general, just two slats (but knives, a blade on them would be desirable to be) standing in the same plane along their edge. They've got a crankshaft on them. The entire package must be assembled - a piston, a finger, compression + oil removable rings, locking rings are put. And look where the crankshaft is trying to get the fuck out - so it raises the piston "up" (the rod's finger at the very top as if), or vice versa, down, as if the piston were in the VMT on the engine, i.e. the rod's finger in the very "bottom" (on the knives).

Soviet books for Soviet nekrukhs seem to recommend 60% vertical axis balancing. But there have been cases that balance as much as 90%. But there the balance is such that either vibrates in the vertical axis (which is felt by the ass and hands), or in the horizontal (which you do not feel, but it also fucks up the root bearings). Here they catch the balance relative to vertical and horizontal, so that it vibrates, but not very much, and so that the bearings do not regurgitate too quickly. And what are the balancing coefficients for a particular motik and his service book, or if there is no such thing, then google or search for adjacent engines of a similar design and other things.

Usually for balancing already from the factory there are holes (through the cheeks or deaf) in the cheeks, a shob to cut the metal from there. Or vice versa, add metal. Well, it's usually squalid-style if. Well, or the "cargo" anchorages. If (??) there are no such holes, so to speak, then self-fresher holes to throw off the weight of the st-no.
In general, it is in the workshops almost everyone. If you're worried that you're going to make it worse, just take it to the service and order the balance, you don't have to say the coefficent, just the "hands are fucked with the vibration, make it smaller, but so the bearings don't move." Kind of like that.