Wiggles took his Reptilink tonight. It's been two weeks, so he was good and hungry. I tried feeding the Reptilink unscented. He was interested. He kept coming back to it, but wouldn't take it. I tried rubbing it on a hopper to scent it. He still didn't take it. Then, I tried dipping the link in hot water. Curiously, that did the trick. I'm encouraged that he didn't require me to scent the link with mouse guts. That's progress.
I think the key factor is hunger. The hungrier he is the less he's going to care what the link smells like or what temperature it is. I may wait three weeks next time to see if he'll take the link unscented.