Despite my attempts to make the throttle cable on my diesel westy butter
smooth, I was still getting catches from time to time. Recently I recalled
mention of the use of a motorcycle cable lubrication gadget--in my case the
Motion Pro 08-0182 cable luber--and ordered one for less than $10 shipped
on Amazon Crime.

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https://www.amazon.com/Motion-Pro-08-0182-Cable-Luber/dp/B0012TYX9W/ref=sr_1_4?crid=34FUP1JXFE47X&keywords=motion+pro+cable+luber&qid=1562334983&s=gateway&sprefix=motion+pro%2Caps%2C142&sr=8-4
>

Once the luber is clamped onto the end of the cable, allowing the rubber
core to seal off exit routes for the lubricant, you insert the nozzle tub
of the lube spray can into a small port in the device. Spray away and you
can hear the cable housing filling up. I used mine in a couple of places
and only spilled out about two drops on the driveway.

Jim