I'd like to know this too, Mine looks just like yours, zip tie and all, but without the grease.. 1 x heater fully adjustable, by getting out of your car, opening the bonnet and moving the parts yourself... At least that way you actually get cold air.
I think the cable tie works fine as is, and it can hold on to the cable hose all right: I have operated the thing several times now

I wound a bit of insulation tape around the hose to give the tie something to bite into, and (also visible in the photo) also a bit of glue. But the tie itself may expand or break at some point.
- Anders