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K&M Neck Expander

Is anyone using the Sinclair expanders? A 20$ die body with a removable cap that actually gives the 12$ Sinclair expander mandrel (already beveled) a little bit of wiggle room to self center.
These mandrels are available in every caliber. Simply chuck it up in a drill and wet sand with a little 400 grit then 600 grit sandpaper when they arrive and you will have uniform and concentric neck tension.
 
Is anyone using the Sinclair expanders? A 20$ die body with a removable cap that actually gives the 12$ Sinclair expander mandrel (already beveled) a little bit of wiggle room to self center.
These mandrels are available in every caliber. Simply chuck it up in a drill and wet sand with a little 400 grit then 600 grit sandpaper when they arrive and you will have uniform and concentric neck tension.

I use the Sinclair and like it, having noticed an increase in consistency in felt seating force and in competition performance. Note: I don't have a means to measure seating force directly. I have not used the sand paper, but I will try it.
 

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