Wing Fuel Tanks (cont.) & Aileron Bell Cranks

The second fuel tank was air pressure tested for several days and held approximately 23" of water for a couple days. Again, I could not get this tank to hold greater than roughly 0.5 psi. Initial soap solution testing of both tanks and associated tank fittings revealed no evidence of leaks, however. Based on these results and consultation with Rans, I decided they were good enough. I have since filled them with unleaded automotive gas and will let them set for two weeks. I'm told they will potentially elongate up to 1" due to interaction/absorption of gas with plastic. Want to make sure this occurs before attempting to install the tanks on the wings. Another pic is shown below of second fuel tank being leak-tested with manometer.

As I'm waiting for tanks to cure, I decided to install the aileron bell cranks to the wing frame. I had initial difficulty getting the spindle flange to seat flush with the mounting bracket (could see daylight between seat area). Rans recommended chamfering corners of hole slightly to remove anodization coating and this worked successfully. After assembly and when mounting the assembly to the bell crank brace on the compression tube, the key here is to ensure the lower bell crank arm remains horizontal to the rear spar (check by positioning parallel to rear spar and looking from behind TE spar). Otherwise, later the nut holding the two arms of the bell crank could rub the fabric on the bottom of the wing during normal rotation of assembly. The type of vise grips shown aided greatly in clamping the assembly to the compression tube so the transfer drilling would be successful. Pic below.