Its a discontinued standard ball bering 40 oz/in .25 for sixty degrees and three pole motor.

If its in good shape for most standard applications no reason not to use it for single servo functions. I don,t care for brand mixing when two servos are used on a Y chord.

If you are using futaba you will find this plug has no polarity spline and its possible to plug backwards into the Rx. No worries if you do it will simply not function reverse and play. It will not harm the Rx or the servo if plugged backwards.

Currently the big four Hitec S (universal), Airtronics Z, JR and Futaba J all use centerpin positive and all are interchangable with the exception of that peskey spline on the Futaba J plug.

Whatever you do don't use the wrong servo arms All four of the majors seem to have either different spline diameters and or spline counts and some combinations I have caught its posible to hold the surface and force a spline slippage. In other words if its a JR servo use only JR or JR specific output arms.

John