Unfortunately the Gon is doing its FORUM MEMBERS an INJUSTICE by blocking Links to other Web Sites that are totally on topic to the content of Thread.
Everybody needs a good old link to help, these are coals on the fire.
Stereophile - Budha Bearing review, a few useful tops about fitting these add-on devices as well.
I have used and will suggest Bicycle Torque Wrench as the tightening tool. The selection of the correct Nm Setting is King in such a circumstance. 4Nm is a very good start point.
An additional Collar used on the Chassis to improve Chassis Rigidity, resulting in substantial reduction on the Chassis Flexion is invaluable.
There is no point having the tightest of tolerances for a new machined Bearing Assembly, set up in a way the Bearing Housing Base is a Pendulum through Chassis Flexion showing the worst of its presence at the Bearing Base.
A Bearing Housing Exchange Is one of a few considerations to be used in conjunction, with adding rigidity to the Chassis and Anchoring the Bearing Housing Base to reduce flexion. Some also have methods to use a Base Anchor as a Energy Drain.