I'm considering scoping my S&W 629, but I'm clueless as to how.

[RickN]

Two zip ties and a Tasco. First between top of frame and cylinder, 2nd in front of frame around ejector pin shroud. You can use electric tape. Three wrap recommendation if only shooting specials, four wraps for magnum cartridge.

I was going to suggest duct tape but your idea is better.