The point being addressed here is how much the indent design contributes to the overall performance of the DC system and both I and huntingdog believe it is a lot less than the friction of the DC system whereas you think it's performance is more from the chains and force of the indent system than friction. I simply don't buy your assertion that real world experience can differentiate how much the overall performance is from the inherent friction of the DC system or from the chains and force of the indent in the DC system and especially going as far to say that the friction is the minor contributor in the overall performance and for someone to believe the opposite view is "INCORRECT" (i.e. WRONG). This is the point of the disagreement and I have to trust and believe those who IMO are capable (i.e. Ron Gratz) to properly analyze and assign numbers to the various parts of the DC system.
Larry