01-07-2018, 03:33 PM
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Old Submariner
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Join Date: Jan 2009
Location: Home of Wayne & Garth
Posts: 7,781
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Here’s the info.
The length of the upper BT55 is 3 13/16”. The root edge (NOT the slot) of each fin begins at 1/8” from the top of the tube and ends at the 7/8” from the bottom of the tube. I don’t have the dimension of the inner BT20, but if you do indeed want my extra cone assembly you’ll be able to extrapolate the length. I suppose the inner BT20 is only needed if you’re going to slot-mount the fins.
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NAR# 94042
SAM# 0078
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