I can see the value of pinheads if on a rack on the back of a van, but I have only ever had my saddle nicked once in thirty odd years whilst "out and about", so just leave the allen key fitting and QR for the wheels, certainly wouldn't be soldering anywhere near any of my bikes. Always park the bikes up in a prominent and highly visible spot.
Just wondering if, in posting this just before we depart for 3 weeks in Denmark and Germay, I may have upset the karma police, expect a post asking for more info on the pinheads on my return!
Ask and you shall receive!
Pinhead main site link https://www.pinheadlocks.com/store/en/
Also available on Amazon UK
Mike