Seiko 5106a Pressmatic

[Levine98]

This beauty was by far the biggest challenge and most complicated movement in my two years of learning the art/science of watch repair (150 parts in total and a mind boggling number of springs on the dial side of the movement).

Purchased as a parts only non-running movement in case from a retired watchmaker, the movement had a broken oscillating weight screw post that was stuck  and it took me two weeks to resolve (with the help of several good chaps on this forum).

Then a couple of weeks hunting around for another salvage movement as source for several missing/broken parts on the original unit.

Finally two days trying to figure out how to re-attach the sprocket to the day wheel while ensuring it has proper alignment with the date.

Fortunately all the case, case back, bezel and crystal needed was a good polish.

Now for a couple of days wearing to ensure proper timekeeping and day/date rollover out in the field before turning over to the “customer” (a friend I offered to do this for at cost as a favor).

Edited October 22, 2023 by Levine98

[Levine98]

2 hours ago, Levine98 said:

This beauty was by far the biggest challenge and most complicated movement in my two years of learning the art/science of watch repair (150 parts in total and a mind boggling number of springs on the dial side of the movement).

Purchased as a parts only non-running movement in case from a retired watchmaker, the movement had a broken oscillating weight screw post that was stuck  and it took me two weeks to resolve (with the help of several good chaps on this forum).

Then a couple of weeks hunting around for another salvage movement as source for several missing/broken parts on the original unit.

Finally two days trying to figure out how to re-attach the sprocket to the day wheel while ensuring it has proper alignment with the date.

Fortunately all the case, case back, bezel and crystal needed was a good polish.

Now for a couple of days wearing to ensure proper timekeeping and day/date rollover out in the field before turning over to the “customer” (a friend I offered to do this for at cost as a favor).

Well, I claimed victory a tad early

looks like the cannon pinion needs to be tightened—even though the watch is timegraphing well, the watch hands seem to be falling behind a minute or so after just an hour and the setting function is extreamly loose.  
 

well at least this gives me something to do on Monday

[Levine98]

5 hours ago, Levine98 said:

Well, I claimed victory a tad early

looks like the cannon pinion needs to be tightened—even though the watch is timegraphing well, the watch hands seem to be falling behind a minute or so after just an hour and the setting function is extreamly loose.  
 

well at least this gives me something to do on Monday

Cannon pinion tightened, seemed to do the trick. 

I grumble when I have to pay $$$ for a single purpose Swiss tool  (in this case my $95 Bergeon Cannon Pinion Tightening pliers), until I need them  

Edited October 22, 2023 by Levine98