new laser/assembly for Cary 303/300 cdp

The SL-710A drive can be found in some very inexpensive dvd players. My Resolution Audio Opus 21 also uses that drive. When mine was having trouble I did a lot of research trying to find the drive at a reasonable price. My research also showed that drive to be a fairly problematic drive.
Ended up buying what was claimed to be an almost new dvd player on ebay that had that drive in it. Sure enough for about $30 I had a like new transport ready for install from ebay.
Unfortunately, I threw the case away or I'd take a look and get you the model number. Google is your friend if you decide on that route.
As for cleaning the lens, I'd take a qtip with a light alcohol dip and swipe it. Be CAREFUL though as it is delicate. You can also get a can of compressed air and blow GENTLY at the lens. Good luck.

thanks Nozz & Timrhu...I'm going to find the part & do it myself. Is it easy to replace the tray with your existing one so the drawer end matches the faceplate or am I way off here? Without taking it apart I can't tell. Thankfully the player still works with some effort reloading discs.

I've used this type: (http://www.amazon.com/Allsop-ProLens-Cleaner-Players-23321/dp/B00000J1QM/ref=pd_sim_23_3?ie=UTF8&refRID=1VJ6KVWZXS0CRXP5RZSF) and this liquid with both a Q-Tip & the included disc: (http://www.amazon.com/DISCWASHER-LASER-LENS-CLEANERS-2-BRUSH/dp/B00I21X5A6/ref=sr_1_1?s=electronics&ie=UTF8&qid=1437755281&sr=1-1&keywords=discwasher+cd+lens+liquid) All have worked for me. I've had a couple transports(someone else's) that wouldn't read a disc enough to use the cleaning disc, and resorted to the Q-Tip/alcohol method too.

I haven't removed the end piece from my Opus 21 but did take off the piece from the drive that came out of the dvd player. I don't really remember how difficult it was but the drive is intact so it must've been fairly smooth.
The Apex AD-3201 is the model that uses the DSL-710A drive.

Go for it.

Here's an ebay auction for anAD-3201.
Might be worth a try.