Screw timing, and dings

[C.Maitland]

Hi folks,
First post here. What a great resource this site is. A couple quick question please:

- If one were to replace some abused screws using the replacement screws offered by CSMC, how are they timed correctly and does this usually required a substantial amount of filing to each end of the screw?

- The subject gun is a shooter and I like it. But, it has a pretty good ding right where the fence meets the barrel, and on both the fence and barrel. There are other issues but this ding in particular just bugs me. Who would you recommend to add material here and rework the areas just so they're less unsightly and at reasonable cost?

Any input is appreciated!