Fan shroud questions.

New pix. I used the all thread just to keep the circular disc part of the mould concentric and square with the radiator side of the mould until i could fit the spacer blocks, then once the drywall screws were installed , i removed the all thread as its no longer needed. An old 2x4 cut up works fine. I decided on 6 to space it out. The blocks are glued to the rectangular part of the mould.

Btw, i used cardboard strip with punch holes in it as a large circle compass to get my radiuses and circles. Works great and is free.

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