Hi Kevin,
distensioning the shutter
Spyderman's picture of distensioning the Kiev is of great importance, and quite unusual.
However, when you do it, you will notice that the angle of insertion of the screwdriver is quite difficult, perhaps the most difficult operation in the Kievs, and if you add the issue of the locker, most of the chances are that at your first tryials you will end with the spring of the drum distensioning to the end.
Don't desperate, nothing wrong has happened, with some tryials you will make it.
Your camera must be cocked beforehand to 1/250 for this as well as for all interventions. This is highly important.
But each time you start re-tension, you must count exactly how many turrns you have applyied, for further corrections.
Now, there are many different ways to check the accuracy of your tensioning in producing the right speeds at the least possible amount of tension. Many, many ways.
The one I use is quite one of the most primitive. I bring a good working SLR I trust, take out the lens and start firing each speed against light, then I compare each speed with my Kiev under surgery.
Stiff grease
With Spyderman's accurate instinct sending you to distension the shutter first of all, we still don't know how stiff is the old grease in your camera. Therefore you must use your common sense to not force anything.
Therefore you will be tensioning against the opposition of this old grease. By now you can accept this unacceptable situation, since you have a new camera and want to make some pictures.
But in the near future you will have to remove all that grease with utmost care of not leaving absolutely and literally nothing of it. Then you will be able to lubricate your camera and recalibrate your shutter for less tension.
Winding with film inside the camera will be more difficult than without. Expect it.
So far by now.
Cheers,
Ruben