Since used ones go for about $50 - $60 when you find them, .....
Bob
I did the same thing for mine about 10 or 15 years ago, and it's still working fine. I was relieved... I've only had it now for about 25 years, and I'd hate to have to replace it so soon!I replaced the toggle switches on my Gra-Lab 300 recently. The case was held together by screws, so no problem taking it apart. Found the replacement toggle switches at Radio Shack for about $4 each. All of the toggle switch wiring connections were soldered on mine, so the longest part of the process was de-soldering and re-soldering everything back together.
Be sure to make yourself a drawing of the wiring before you take anything apart.
I had this problem too... about 20 years ago. You don't need to remove the cover. The knob that holds the second hand should have a set screw that holds it to the shaft, and you just need to tighten that. Mine was so loose that it would "clunk" as it went over the "0"!I have a Gra-Lab in pretty good shap, but I, too, need to take it apart to troubleshoot a little problem: the timer hands don't stop when they circle around to dead-center zero. My question is, yes, I see four little screws that appear to hold the metal casing intact (two on top and one on each side), but what about the three toggle switches (one on top and two on the face); don't the threaded retaining rings also need to be unscrewed so the metal case can slide off, or is it just the top toggle switch that needs to be freed? Any constructive advice would be greatly appreciated!
Hi, just take out all the screws/plastic rivets on the and the back cover will come out. No need to remove switch or other stuff. (But the hands on the clock and knob can be taken apart from the front side without disassembly of case.)Sorry, but the set screw on the main knob is as tight as ... (fill in the apparopriate example). Methinks I really have to take the metal cover off to get into the guys of this beast; and although I could start prying with a screwdriver, I would much rather be guided by the counsel and good talent on this board. Once again, I need some DETAILED advice on exactly how to take a Gra-Lab apart.
No matter how much work it is, traditional photography - especially B&W photography - is way better than digital!
The set screw may be tight, but it is tight in the wrong place, namely not at 12:00 on the clock face. Loosen the set screw until the knob turns freely, then turn it to the 12:00 position, and tighten it again. I'm assuming you are speaking of the second hand, which has a set screw in the knob. The minute hand is separate (of course) and has a set screw underneath the knob. All of this is on the front of the face, and you do not need to open the box to adjust it.Sorry, but the set screw on the main knob is as tight as ... (fill in the apparopriate example). Methinks I really have to take the metal cover off to get into the guys of this beast; and although I could start prying with a screwdriver, I would much rather be guided by the counsel and good talent on this board. Once again, I need some DETAILED advice on exactly how to take a Gra-Lab apart.
All of the toggle switch wiring connections were soldered on mine, so the longest part of the process was de-soldering and re-soldering everything back together.
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