Top Flite TOPA0704 - Manual (Page 31)

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8. Attach the cowl ring with two 6-32

1-1/2" [38 mm]
socket head cap screws and #6 fl at washers into the
top two blocks.
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9. Using the same procedure used on the top two
blocks, drill a hole into each of the lower two blocks.
Once you have the starter hole in the block, remove
the cowl ring. Mark each of the lower blocks so that
you can identify the left and right block.
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10. Remove the cowl ring. As you did with the top
blocks, drill a hole through each of the blocks with a 5/32"
[4mm] drill bit. Install a blind nut into each of the blocks
using the same method you used for the top blocks.
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11. Bolt the lower blocks to the cowl ring with two
6-32

1-1/2" [ 38 mm] socket head cap screws and #6
fl at washers. Slide the ring in place and put two more
bolts into the top two blocks.
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12. Check the fi t of all the blocks and the cowl
ring. When you are satisfi ed with the fi t of all of the
components, glue the blocks to the fi rewall box with
30 minute epoxy. When determining the fi nal position
of the lower blocks the cowl ring should be parallel to
the front of the fuselage. Allow the glue to fully harden
before moving to the next step.
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13. Locate the eight plywood rings shown in the photo.
There are two different diameter holes in the rings. Glue
one of the rings with the small diameter hole onto the
ring with the larger diameter hole. Make four sets.
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14. From the 1" [25mm] length of large diameter fuel
tubing cut four pieces 1/8" [3mm] wide.
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15. Remove one of the cowl mounting bolts and
washer from the cowl ring. Slide the bolt and washer
through the smaller diameter hole of one of the sets
of rings you made. Slide one of the 1/8" [3mm] wide
pieces of fuel tubing onto the bolt. Slide the fuel tube
into the large diameter hole in the ring.