[LettersFromFlyoverCountry]

In the avionics kit, chapter 42 Page 8 Figure 1 has you enlarging a hole to 5/16 of an inch. This really should have been an instruction way earlier in the instructions because it is very difficult to get anything in there to drill a straight hole. Observe:

You have approximately four and a half inches of room to work or roughly the width of two wing spars.

It seems like a right angle drill would be the idea here but I don't have one that will fit in there and I'm wondering if anybody else has reached this point and has a solution and if so and it requires a particular tool which one are you using?

This might be an artifact of fuselage kits from before the avionics kit was available.

 

[Bob Y]

In my plans, which were earlier than yours (6/11/18, revision. 0), the hole was 3/16” and it used an SB187-2 bushing. It was tight running the wires, but they did fit. So, assuming it’s still the 3/16” hole you’re being asked to drill out, and you can’t get a bit in there, you might just try installing an SB187-2 and seeing if the wires fit ok.

 

[LettersFromFlyoverCountry]

That makes a lot of sense and seems like the only viable option.

 

[koupster]

Bob,

If you have to enlarge the hole, you can use something like this https://www.homedepot.com/p/RYOBI-11-in-Flexible-Shaft-Bit-Holder-A10FB1G/205193137?source=shoppingads&locale=en-US&&mtc=Shopping-CM-F_D25T-G-D25T-025_009_PORT_POWER-RYOBI-NA-NA-SMART-3047250-WF-SMARTSHOPPING_PL2&cm_mmc=Shopping-CM-F_D25T-G-D25T-025_009_PORT_POWER-RYOBI-NA-NA-SMART-3047250-WF-SMARTSHOPPING_PL2-71700000083187721-58700007049582706-92700063451361509&gclid=Cj0KCQjwpv2TBhDoARIsALBnVnn9zVPkVn5e7Hny1ODNSAz89m9cg6Xu7ICFykr4Rfr4QymjSGmMdsoaAidLEALw_wcB&gclsrc=aw.ds#overlay with a hex shank drill bit. I use one of these all the time to remove/replace phillips head screws that are in a corner.

 

[RFSchaller]

Have you tried a right angle drill attachment? The aviation ones are pretty small with threaded bits so no chuck.