If I Sent every piece back that was more than 15$ difference in weight when compared to the same piece of same wood I don't think I would have one set left in my collection. Not saying that is the way it should be because the manufacturer should have more control on weights, I agree. It's just the demand for wood sets seems to have risen and the quality from the top manufactures in India I contest is getting sloppy. This is in no way blaming the retailer at all. What the retailer should do however is demand the weighting of like pieces with the same woods should have closer tolerances.
Unfortunately the sets can't be inspected that close at the retail level as the labor to do so would make the sets rise in cost at the retail end. It is so competitive.
After being away from chess for decades, I have inexplicably managed to purchase 16 chess sets over the past few years. These purchases included new sets from the higher-, mid-, and lower-ends of the market as well as used sets.
I have learned that the quality of chessmen can vary a lot and that price alone is a poor predictor. For example, I purchased a set in the $1000 range in which the white king had a severe - and obvious - tilt due to a weight protruding from the base. I have also purchased $15 wood sets whose quality was consistently excellent.
To mitigate inconsistent quality control processes, I inspect 100% of the chess sets I purchase and I contact the retailer immediately whenever issues arise.
There's not much available information about how to inspect chessmen so I developed my own procedure below. Before inspecting a chess set, I recommend setting aside about an hour and to have the following equipment on-hand:
Step 1: Weigh each piece.
Use a digital scale to measure each piece. Variations in weights of individual chessmen can provide an important clue about the retailer’s quality control capabilities and the overall quality of the set.
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Step 2: Inspect the bases.
Inspect the bases of each piece carefully as many issues occur on the bottoms of chessmen.
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Step 3: Inspect the chessmen individually.
Inspect the body of each piece. Note that this is usually the most critical and time-consuming part of the inspection.
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Step 4: Inspect the chessmen collectively.
Group the pieces by type (i.e., pawns, rooks, knights, bishops, queens, kings) and compare them. This is an important way to spot inconsistencies between pieces - especially the knights.
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Step 5: Play with the set.
Finally, be sure to play several games with the new set - as white and black - to confirm you are comfortable with the balance and playability of the pieces.