Our postmaster said to always do ‘non-machinable’ if you do pucks-- the edges get caught in the sorters- where coin-flips are basically a ‘ramp’ or the washer to not get stuck…
Only makes sense that it would work to put pucks in flips- a pain in the ass… but I guess better than extra postage!
(note: our postmaster hangs out at the dispensary and local '‘smoke and toke’ coffee shop!)
A single peace of tape length wise of the card over the puck is enough, the angle of the tape smoothly guides the rollers over the puck. No need to put them in coin flips.
Yes also my mail person said to, in the USA, buy the non-machineable stamps they are $.74 I think and write non-machineable on package no rollers and gives you a little more weight.