I DIY'd a way to mount my Rack mount B&M taillight, on my Bike Friday, without a rear-rack.

Using Old Zefal Mudguard struts and hardware,
fabricated to use the back of the seat post, low water bottle mounts..


Old touring bike .. handle bar bottle cage mounting brackets,
let me turn a strap on to the bars bag
into one that stood off a ways in front of the handlebar..

no DIY solution to failed digital cameras though..