I want to buy a Shimano hub dynamo, but I'm encountering problems getting a bike shop to commit to installing it for me if I buy it. So I have a couple questions that I'm hoping some of you guys might be able to help me out with.
Can a wheel be rebuilt replacing the old regular hub with the dynamo? Or does this require a new wheel to be built? (I've heard once that it's difficult to rebuild a wheel with a rim that has already been built before).
If you can rebuild a wheel, and the hub is a bit larger in diameter than the old hub, do the spokes need to be replaced/shortened, or can they be still be used? Is there some guideline or rule of thumb about the length of a spoke as long as they're all consistent?
Is the installation of a hub dynamo the same as a standard hub? I know that the hub has a lot of moving parts inside, but it seems no different on the outside, and I wonder if there are special steps or considerations when installing.
I appreciate any info anyone can give me! I feel like these bicycle shops have simply never had any experience with a hub dynamo and their first reaction is just "no".
Edit: As a side question, does anyone have any experience with wheel building? Is this a straightforward process? This is something I wouldn't mind learning how to do. Is this the kind of task where you can destroy a wheel or two in the learning process, or will I just need spend more time adjusting to get it right as I learn?