Replacing Lens Bayonet Mounting Ring

[tinplater]

Has anyone in this group replaced the bayonet mounting ring on an FE lens?  My A7rII with 70-200 attached sustained a fall.  Fortunately everything works perfectly, but since then the lens mounts with more radial play than my other lenses.  It kind of annoys me.  I thought it might be a consequence of damage from the fall and replacement rings are available on Ebay for around $30.  However removing the current ring is a challenge, the four tiny Phillips head screws are so tight that I don't want to force the issue unless that is the norm.

[Username]

They're not exactly philips. They are IIRC 

minicross [or something like that] and you 

need the correct tool as well as a solvent 

for the sealant that locks the threads. As 

there is no standard as to choice of which 

sealant has been applied, I'd try Goof Off 

cuz it works on almost everything and cuz 

acetone evaporates so fast it hardly has a 

chance to do its job.   

   

Full disclosure: I've never dismantled a lens

newer than an AI Nikkor, and would not buy 

any newer lens that cost so much that it's

not simply disposable, like a Dixie Cup .... 

UNLESS it's such a costly [and wonderful] 

lens that paying a profession to repair it is 

quite clearly worth it. IOW it's the middle

ground, value-wise, that tempts self repair.   

   

What is Primo, Middle Value, or Dixie Cup is 

relative to the user's finances, so I will not try 

to assign actual dollar values. I infer by your 

quandry that the lens in question is, for you, 

a mid-value lens. Flip a coin ?