Just a tip.
I did the throttle connection a little different, my OCD got to me when I saw the HT cable bind up when the FT was actuated. I went to a wrecking yard and picked up the little cover that attaches the spring like in your photo. I found the HT cable threaded through it like the spring does and it clips on the opposite side of the FT cable. I then put an cable lock that is used on RC airplane linkages.
This set up allows the cable to slide through the cap and not bind up when using the FT.
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very nice. I may do the same. thank you.