I've started work on the canopy and have found a ton of material regarding fitting and gluing the plexiglass. However, I'm stumped regarding instructions concerning the slide block and anchor block. A hole has to be drilled in the slider block to permit a pin to engage the pivot arms of the canopy frame. However, no dimensions for placement of the hole are given. Rather, the instructions refer to proper clearance within 1/32 inch. The design of the slider block - with "ears" covering the pivot arm holes make precise measuring of the hole location improbable. My initial inclination is to center the hole on the ears and take whatever clearance it gives. However, I'm not sure if that won't set me up for obstruction issues later in the process. What am I missing?