What the operator is controlling
The CHA LEFS 8010 guide controls its included 63-foot and extension wire arrangements, Line Winder Assembly, feed connection, sloper, and horizontal/NVIS configurations. Other LEFS products have their own guides.
Where people get into trouble
A part that screws in or clips on may change transformer loading, current distribution, voltage, balance, support load, and tuning. Physical fit is only the beginning of the question.
A repeatable field method
Identify the exact product and guide revision, verify the full electrical path and included components, use only named options, and label any unsupported field variation as experimental rather than compatible.
Follow the current guide for the exact CHA LEFS model, radiator, feed assembly, geometry, supports, and operating limits. A family name or mechanical fit does not establish electrical compatibility.