Troubles with Array along a curve, an oval actually.

Hi Everybody,

I'm quite new to GH and now I have met the first obstacle I couldn't overcome with a search on this forum. 

I have designed a workflow to realize an eternity ring, which works nicely, then I have decided to add the option to use it also for oval stones.

To achieve this I had to change the type of array, for the prongs holding the stone, from Polar to Curve and here began my troubles.

I used PointOnCurve to design the prong so I could be able to change the position of the prongs; on a circle worked well, but here…

I made a workaround, highlighed in the file, to get at least the 2 basic positions but I'd really like to be able to move them freely.

Another slight matter I stumbled upon is SolidUnion, which seems not to work with pipes, as I could read on other posts in the forum, even though the baked pipes BooleanUnion nicely in Rhinoceros… any suggestions?

Thanks in advance to anybody who could help.

Michele