by sonex1374 » Sun Nov 29, 2020 11:43 am
Carlos,
I don't think there is a real-world problem with using a single AN4 bolt to hold the tail spring to the mounting bracket or the tail wheel assembly to the spring. I can't think of any reports of this AN4 bolt breaking, and my feeling would be that if a user did experience a bolt failure then there is likely something else that contributed to the situation (a bur on the hole edge, oversized or out-of-round hole, etc).
There may be some benefit using two bolts to hold the main gear socket to the lower gear leg (these can wallow the thin-wall tubing of the socket), but even that is not a common problem. If the socket does loosen up around the bolt securing it to the gear leg you can repair it by welding a doubler on top of the existing hole and re-drilling to match the gear leg. You could even weld on a doubler before initial fitting as a proactive measure if you were concerned about operating off very rough terrain.
In all these cases there is no clear trend suggesting that modifications are mandatory to the main gear, tailwheel or bolts. Lots of users are flying with the stock setup and it has been working well for the majority of them.
Jeff