three nail propellor balancer.

I did my prop a mischief yesterday and I'm repairing it today.
After the puttying and sanding I will need to balance it so I made a balancer.
The rails on the balancer along with the prop spindle are 100mm nails.
This design is for my 1400mm prop.
This is a full sized prop it is not a model.
I'm supplying the stetchup file so it can be enlarged if needed.