SPRING BITE INDICATOR T10s

Yes of course, by far the best bobbins I've used. Wouldn't use any others now.

Each come with a spare spring and Allen key. Simply remove grub screw to remove spring and bearing. Don't see why you'd need to change bearing? The spare spring I believe is stronger to give better line retention?

Easy.

You can if you have you locate it under the rod rest part that holds the rod instead of a bite alarm.

I don't fish at night but would imagine you would see them when your alarm sounds to see which direction the take was in, I would set your line in the line clip and position them in the vertical position that way you would instantly see if the take was coming towards you or away from you, using the line clip gives you that bit more sensitivity and aids positioning, great little piece of kit.

No as the bobbin part has spring loaded parts but a quality product

These are one of the best pieces of tackle I've bought in a long time Excellent piece of kit and very light

Dont know but they are nice indicators i use my regulary

Yes they can that's how I use them,,