Yea, I'll agree, having that forte to complete your own install, definitely helps quite a bit. But you still have the costs of product fabrication still.
In my case, my install cost(s) were below average due to the fact that i've developed an incredible repoir with my mechanic over an almost 10yr period.
He knows i'm a weekend gear head & allows me to assist with installs at his shop. Unusual in this day & age, but as he explained one day "you're by no means the typical customer. I enjoy working with you cuz you stay out of my way when necessary, and you have an incredible, underdeveloped skill talent."
He also said that the work I bring him, is refreshing, as it's "fun stuff" that rejuvenates him, & gives a break from the monotony of day to day routine repairs.
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