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Old 08-22-2021, 04:06 PM
mc607 mc607 is offline
Join Date: Apr 2014
Location: Canada
Posts: 67

[quote=RV701775;1549984]Thanks for the feedback. I will likley put a smear of pro-seal as well.

The #12 drill bit is 0.189", too big for a #10 die pilot. I contacted Cleaveland to check the pilot and they stated that "Our Die pilot is 0.1905 +- .00015 so 0.19035 to 0.19065" and suggested a #10 drill bit. This would require me to drill the hole to a #10, .1935 in for this to fit, not #12. Not sure why Vans suggest #12 if the dimple die will not fit.
I just tried my 509-10 in a drilled #12 hole and it went in but only after deburring the hole.

With regard to the below flush countersink. Even at .007 the counterweight sits a bit high. I assume this will pull flat against the web of the rib once the screws are tightened? Proseal will likley also help mitigate movement.
Just so we're clear on the .007 below flush that vans refers to in section 5, it is meant for countersinks that will receive a dimpled skin. Like when you do your horizontal stabilizer and wing spars. It does not apply to all countersinks. Regarding my previous post I mentioned a micrometer. Meant to say digital caliper.
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