DP-D1 shaft allignment propeller nuts

[tallyho333]

The DP-D1 manual on page 43 under the checking backlash section mentions a set of propeller nuts for getting the proper distance from shaft center for measurement, but there is no tool number reference, and a search on the internet has not produced any info on them. There is an alternative procedure for using the cone on the inner shaft (forward gear), but nothing for the outer shaft (rear gear). Is there an alternative for that measurement? If not, where can we get those propeller nuts?

THanks
Capt Bob S