Bad news from the mechanic - any insight greatly appreciated!

[The Radium King]

Originally Posted by Anker

The 2nd gear problem fixed by the detent is popping out of gear, not for being hard to engage.

it pops out of gear because it is not engaged properly. same issue, same fix.

[speedyspaghetti]

Originally Posted by The Radium King

it pops out of gear because it is not engaged properly. same issue, same fix.

Is this the correct item?: https://www.ebay.com/i/112562832848?chn=ps

There is also a "shift arrester" I found - are there any pro/cons to either one to consider? This also looks pretty straight forward to do - would it be easy on jack stands or should I pay to borrow a lift? There's a place near me that charges $35/hour.