Congrats on the 423, it’s a Boom safety prop you can see it used at 1:03 and 1:32, when working under the front it’s a safety prop to prevent the boom coming down on you, it has a spot you can carry it and if ever you need to raise the boom and work under it best idea is to put it in, life’s short best to live it to the max 👍😁
@@phil.vision that’s aux control lever, it is on the joystick, but if you are using something like an auger drive or trencher and you want it engaged constantly you use this lever instead of joystick buttons 👍