Why do you have threaded inside end spring plungers?

The standard Spring Plunger line, the body is a 2 pc construction. It is made up of the threaded body and a threaded set screw which screws into the back of the body. This is the original design of the spring plunger. The advantage of this design is that it gives the best side load force for plungers that are crimped at the plunger end. The disadvantage is that if you need to install the plunger from the non-plunger end, it does not allow for this. This is why the other style plunger came into existence.
original spring plunger
slotted end plunger
So the plunger with set screw (original spring plunger line) in back of body are not recommended to be installed using this set screw. They are designed to be installed at the Plunger end using a Vlier wrench. Wrenches are thread sizes. You probably do not see these at competitors because it was the original design of the spring plunger and is hand assembled. Wrenches are sold separately.
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