This is the sound of an old primer gun with front loading mechanism. It is just the clicking of the hammer, wich is designed in the style of an old flintlock gun.
Recording of piano (physical, not electronic keyboard) tones and a chord (mostly c in different octaves), made quickly with cellphone with a little bit of noise, hopefully can still be useful.
The wonderful sounds of a 1981 ibm pc model 5150 being turned on, the 5. 25" disk drive checking if a diskette is inserted, the pc emitting its idle hum, and finally being turned back off.