Bathroom basin tap installation

Fogle1980

Hi, I need to replace my tap. We have a custom built shelf with a freestanding basin on top and a tall tap. Access below the sink is very restricted and the current tap is fixed about 20cm below the tap
using long threaded bolts. I know this isn’t ideal as it’s so far away to get a tight connection but it’s worked ok for the last 10 years.

I’ve noticed most of the replacement taps are now fitted with a cylinder screw type arrangement (approx 32mm diameter) with the tap tails running through the middle.

I doubt the opening below our sink could
accommodate the cylinder. My question is could a plumber remove the cylinder and fit threaded bolts or is not that option? 

nofoollikeold

1. The answer is no I'm afraid.  The tap would be designed to have either the threaded shank for a 35mm opening, or the threaded bar and "horseshoe" washer arrangement.  It would take an engineering shop to change it, and even then it might well not be feasible.  
2. Can you determine the diameter of the existing hole?  Might well be 35 mm anyway, as that is pretty much the standard these days.  If no, perhaps it could be opened up to 35 mm, or sleeved down if too wide.