Machines are useless? Well, I don't know about that. Those lat pulls do some decent work on my lats. If you know of any lat exercises, let me know, I'll be glad to get off the machines (in all honesty, I prefer bumbells to machines).
As for the spotter... I can testify that you DO need one if you're not sure you can lift that amount of weight "X" number of times. I've lifted withot a spotter before, and got bad results. Luckily, the first time someone was nearby and could help me get it off of me. The second time I was able to just roll the bar onto my stomach and sit up.
You did put a lot of effort into this however, and I commend you for it
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