Removing clause 60.4 does not mean it is not re-measurable - it just means that you always use the BofQ rates even when there is a major change in quantity. Clause 60.4 ring fences that only a certain amount of change in quantity do you carry on using BofQ rates - beyond that you would normally assess the extra/under over as a compensation event using Defined Cost.
It means that if the Contractor has a big fat rate they can carry on using it, and if they have under-priced it they will carry on losing more money if the quantity increases. Clause 60.4 tries to make this fair to both Parties but deleting that clause obviously cuts through this. It means that it could turn out to be a commercial advantage to either Party - but neither Party will know who will benefit before it happens - bit of a lottery! Not the first clause I would recommend to delete.
It means that if the Contractor has a big fat rate they can carry on using it, and if they have under-priced it they will carry on losing more money if the quantity increases. Clause 60.4 tries to make this fair to both Parties but deleting that clause obviously cuts through this. It means that it could turn out to be a commercial advantage to either Party - but neither Party will know who will benefit before it happens - bit of a lottery! Not the first clause I would recommend to delete.