It is easier to use Fat Daddy pins. Stumpy is 2.5mm. Shorten it with Dremel cutoff and narrow the head with a bench grinder. Then it is easy enough to drill a hole above the center pin for flow into the main
I notched one of my clone Stumpy's, I forgot about the FDV pins, great call there.
And totally off topic but I'm an AU717 fan myself, got one sitting in the rack under my Thoren's...