another option would be to just trim the excess plastic from the spypoint's sensor. The extra plastic is there to support the bungee cord mounting.
I found that the Acorn I have doesn't illuminate the same everytime and especially if the batteries are getting low. I checked the 2-6v's on Sunday and they were 6.3v. I replaced the extender and the trigger batteries to after checking them. The extender fired once and then has stopped. I notice that the Acorns glow is different sometimes now that the only glow is coming from it.
So what I'm getting at is, if the trigger eye on mine isn't placed away from the IR's and is closer to a single IR it might not trigger my unit as mentioned before when I had those extender issues. The Acorn is still sending pics but the IR's are too dull evidently. I'll switch out the 6v's this weekend for a single 6v SLA and check the results again.
If you trim the plastic away from the eye on the Spypoint you better be very careful as the plastic mold may not cooperate
well and ruin it. I think modifying it would void its warrenty too.