AAHHHH, yer all a bunch of wussy pussies.
The only reason I jest mount my Sov is so that I can operate the controls more easily while swinging.
I donot bother to chest mounting my Infinium and can swing that for 6 to 8 hours straight. I have been detecting almost every day for 48 years though so I guess that helps a bit.
I can remember going through a spell of RSI for about 12 months but it eventually cleared up on its own accord. Your body is designed for hard work and if you donot work it then it will turn to slush.
I broke an ankle once but didn't want to end up on crutches for several months so I strapped it up myself and kept on walking on it (carefully), I reckon that ankle is stronger now than my good ankle.
So what I am saying is that if you work through the pain your body/arms will be better for it.