Just stumbled across this thread, thought I would add my thoughts. I’m definitely a rank amateur lure maker Andy

I may even add that to my signature for kicks. And I did put myself out there for criticism by making a Youtube video – trying to help others learn as I learn, but also making a fool of myself sometimes, I guess.
With no lure making mentor and so few people ‘in the know’ willing to share details, there is definitely a steep learning curve. I’ve watched most all of the lure making DVD’s and read all of the books currently available, but even then I seem to have barely scratched the surface on certain topics. Taximan – your comment on sodium benzoate and weasel glands is something I didn’t know when making the video, so I appreciate you bringing it up.
Most detailed questions about lure making get a similar response: “I’m not going to give away secrets it took me many years to learn on my own. It’s something you will have to figure out”. I understand and respect that completely, especially since a lot of you guys rely on selling lures for a part of your income. So that’s what I’ve been doing for the past couple of years – trying to figure things out on my own. I’m sure it won’t be the first time I do something foolish like adding a half ounce of tonquin to a few ounces of glands!
So back to the reason for the gland lure – mixed glands from marten, fisher and weasel. (For what it’s worth, if I had 4 oz of marten glands, that’s all I would have used, but I didn’t, so I used what I had.)
We’re required to use lynx exclusion devices to trap marten and fisher in Maine. There are two different models. The 120-sized device provides an unobstructed view to the bait and back of the box, while the 160/220 style does not allow line-of-sight, and requires a 90 degree turn and an 18” span to the trap and the bait. Last year I ran a line with 30 of each style device. 80 percent of my marten and fisher catches were in the 120 sized device, despite the smaller opening.
So why were marten and fisher consistently refusing to go into the larger box? I could only think of two reasons – they had to make a sharp turn, and they couldn’t see the bait or the back of the box. That got me thinking about ‘comfort’. Perhaps the wrong word, and maybe I’m completely off base, but it seems that they weren’t comfortable going into a foreign object that they couldn’t fully see and didn’t know what was inside of, even though they could smell the bait.
My thought was that if there was evidence that another mustelid
had been in the box, any mustelid, it would give a marten or fisher some level of comfort that it was fair game to get in after that bait (ie there wasn’t some strange, dangerous thing in there they didn’t understand). And maybe the gland scent would trigger an added level of competitive instinct (I’d better get the rest of that bait before one of my competitors comes back).
So it was an experiment. Over the course of a few months the tonquin actually mellowed out, and the gland odor is more prevalent (still have wayyy too much tonquin scent though).
We’re now a few weeks into the trapping season. I used a small amount of the mustelid gland lure in most of my larger boxes to try and test out the ‘comfort’ theory, or whatever you might call it. So far the catches in each style device are running 50/50. Could be a number of different variables, could be the lure. It’ll take a lot more testing and tweaking to figure that out, but as with lure making, I’m learning. Thanks for the insight, and hope you guys don’t mind cutting me a little slack along the way
