Deformation of PTH component pins during handling
My preference in this situation is to machine a fixture that holds the part while it is being soldered. 

You can use spacer tubes on the leads (various suppliers including Bivar and there are cheaper ones out there). 

You can use spacers that are designed to wash away in aqueous cleaning solution. 

You can have a die made to preform the leads or order them. This is commonly done when mounting parts that get very hot, especially on really cheap PCB laminates such as paper-based phenolics. (Photo credit to this site).