In order to mitigate this effect, the capillary clamping position is adjusted to an antinode of the capillary. Ideally, the capillary would be short, but this is not possible because the bond needs to be made in hard to reach areas. The bolt clamps the whole structure together by screwing into the horn (depending on the configuration). Correct preload needs to be administered in order to optimize performance. Piezo ceramics are weak under tension; therefore, a large preload will ensure the ceramics will operate mostly in compression due to the bias stress.