Insert ball bearings are designed in almost the same way as deep groove ball bearings, except the outer ring is spherical and with wide inner rings.
内嵌的球面轴承除了球面型的外圈和超长的内圈外，其他的设计结构与深沟球轴承很相似。
2
Take the new lamp from the package and loosen the two side ring nuts and insert in the mountings.
从包装内取出新的灯具，拧松悬挂框两边的环状螺帽并装上悬挂框。
3
Now you see the piston, and the metal ring; this parts will insert into the back end of the barrel. the end cap you are seeing the from T1 test shot, not good yet.