I buy my Needle kits directly from the Mfg, so I'm certain they are the right ones. The Needle Kit listed directly above is for a HV3500....not a HV2900
Is there any difference? I cannot say for certain....but if the Mfg states that a particular part is designated for a particular Gin, I tend to go that direction.
Personally, I'm anxious to know if the needles available for $30.00 incl. Shipping are the right ones. That would be wondermous indeed.
BTW, although I have a 1.0 mm needle and a 1.5mm also, I have yet myself needed to change from the 2.0mm. When correct spraying is done, "Duster fashion", the amount of paint laid down is not excessive. In fact it allows me to paint a 54" x 96" Screen surface in under 50 sec. But granted, with the amount of paint it does squirt, there is little room for error as far as one maintaining bith the correct distance and speed to avoid runs or drips.
A 1.5mm needle should be a good compromise, but one must be careful to practice with such, and note both the pattern size, droplet size, and amount of coverage obtained. It seems intuitive to me to expect that the number of Duster Coats would rise proportionately to the lessor amount of paint being applied by the 1.5'er. But then again, the smaller droplets will tend to dry more quickly, so down time between coatings might be lessened by an appreciable amount.
Here is a link to the Mfg site:
Call 'em and ask about the compatibility of the needle Kits for the 3500 vs 2900
Just above all else, practice on something toss-able. A 3/8" x 4' x 8' sheet of Drywall is a pretty cheap palette to experiment on.