Insert the led into the enclosure.
The anode (+) has to be on the left side.
Take the pcb and lead through the pins from above.
This methode seems to be tricky, but in my case it always worked after the second or thrid “take the PCB out, bend the pins a little bitte, put the pcb in again”: ?
Important here: Don’t use force!
Now: Add the cap to the push-switch. Then by reheating the already set solder joints try to fit the switch to the enclosure. After that solder the missing 4 Pins to the PCB.
No picture available.
If we ground the enclosure it will act like a shild. Ungrounded the shielding effect is much smaller.
While inserting the ICs try to stablise the pcb by supporting it with your finger(s) under the pcb.