I have an old Ilex Paragon 12" in an Ilex shutter which was included with my 4x5. Its an 8x10 lens, but I use it on the 4x5 as a tele. Problem is the slower shutter speeds don't work properly, or work inconsistently. I generally only use on long exposures anyway, so it hasn't been much of an issue, but I'm looking to get a cheap 8x10 and it would be nice if I could just use this lens on it rather than having to buy another for it. I was thinking about having a go at fixing it myself. How realistic is this for someone with nill experience at shutter/camera repair? Are there any resources that I might refer to for help?