What technique can help insert a tight-fitting inner sleeve into a tubular repair?

Chilling the inner tube while heating the outer tube is a technique based on the principles of thermal expansion and contraction. When materials are heated, they expand and become larger in size; conversely, when they are cooled, they contract and become smaller.

When you chill the inner sleeve, it reduces its diameter, making it easier to fit into the outer tubular structure. Simultaneously, heating the outer sleeve causes it to expand, further increasing the space available for the inner sleeve to be inserted. This method takes advantage of the properties of thermal dynamics, allowing the two components to fit together more easily without damaging them or requiring excessive force.

Using an adhesive would create a permanent bond that does not allow for any adjustment if misalignment occurs, and hammering the inner sleeve could risk damaging either component, leading to a poor fit or compromising structural integrity. Heating both components together might not create the optimal fit, as they both expand and may not allow for easy insertion. Thus, chilling the inner tube while heating the outer tube is the most effective method for facilitating a tight fit in this scenario.