Re: HO Truck Bolster Clearance Hole

Denny Anspach <danspach@...>

I am responding to an older post (16 June) that addresses a common problem: the commonly-wide truck bolster holes that are designed to fit over the shouldered body bolsters common to to almost all production styrene models, but are far larger than the diameter of the common 2-56 screws that most use for truck mounting on those cars without the 'shoulders'.

Tahoe truck bolsters are drilled out to 0.120", while Accurail's are drilled out to 0.125" (1/8").

Even with the pan-head 2-56 screws, these trucks too often still have markedly excessive side play, which can and do play havoc with good reliable centered coupling, particularly with the "scale" couplers with their smaller gathering faces. This is despite taking every other known precaution with accurate wheel sets, careful coupler installs, etc. Very frustrating at times-

One solution is to drill out the body bolsters to first inset and then cement in place a small piece of 1/8" styrene tubing to form a new 'shoulder', which then can be tapped for 2-56.


Denny S. Anspach MD

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