Majestic 1600 Head weight limit?

Anyone know what the max weight limit for a Majestic 1600 geared tripod head?
I am using it on an Arkay Senior studio stand.

The stand has a lower limit

Test how much weight the stand can balance with OE lead weight and cable

I have 2 of them

My HORSEMAN LX 8x10 with big lens, Sinar Shutter, hood is too much for the stand, not the head

Lastly the stand 'arm' is cast aluminum and can be broken

and if it is this type legs, be very careful to not get the loaded arm off balance, you must keep a heavy load near the middle of the 2 long legs

I learned that by experience, almost an expensive disaster