Supported with Prayer

5 And thou shalt put it under the compass of the altar beneath, that the net may be even to the midst of the altar.

6 And thou shalt make staves for the altar, staves of shittim wood, and overlay them with brass.

7 And the staves shall be put into the rings, and the staves shall be upon the two sides of the altar, to bear it.

8 Hollow with boards shalt thou make it: as it was shewed thee in the mount, so shall they make it.

Exodus 27:5-8

Consider if the weight a person could carry on average was 50 pounds with the arms bent this way from the shoulder on down, and the majority of weight being carried there in the hands with two bends in the equation almost as you would lifting weights at the gym, that's a pretty good start. Though most people can't lift 50 pounds in one hand but rather closer to about 25 unless they're used to it usually. By putting the weight further up on the arm, with two bends in between and held close to the body, you've just increased the weight being lifted from 25 to about 50 just because the distance is lessened. That is to say

Weight lifted = Distance traveled or closeness/number of bends in the joint

Then you could consider increasing the equation once again simply by removing one joint from the distance. That's to say, I could conceivably lift up to four times of that amount simply by holding everything close to my chest. There's only one bend now which means things are being supported or carried on the upper arms that you'd mentioned.

Weight lifted = Distance traveled or closeness multipled by number of bends in the joint

Thus, the 25 pounds in the hand has become more like 100 which in kilograms from which some would've measured makes it more like unto

100 / 2.2

Or 45.5 with the original weight being closer to 11.4. Either way, that's a pretty good use of the body. There's a fulcrum joint there in the picture which means, the sticks have been placed to stabilize rings, thereby increasing the weight borne on the whole from the net in the middle should anything be placed on it were such a thing even possible. Basically, the shoulder would've been in some sort been supported by prayer. Then there's the sticks of some strength with which are meant to add stability and strength which are supposed to be well-selected and dipped there in bronze. That's to say, the mixture that's melted can be dipped in from one end and allowed then to cool or the mixture simply is poured and allowed to harden at will. Though there's few ways of doing this without drips on the whole or possibly puddles there on one side.