I used to same but since theymos updated quoting using AJAX I'm using another solution to quote lock threads.

Method which theymos call it quotefast

https://bitcointalk.org/index.php?action=quotefast;quote={x};sesc={y};xml

x=is the post id you want to quote https://bitcointalk.org/index.php?topic=5421039.msg61293646#msg61293646
The last digits in the url after msg;

y=is you session link

x is easy to get

y is a bit tricky
- Right click on the any quote button on any post and copy link address


- Past it anywhere and it will look like https://bitcointalk.org/index.php?action=post;quote=61608770;topic=5434644.0;num_replies=8;sesc={some big string}
- the string after sesc= is your y

- Replace these ids here in {x} and {y} https://bitcointalk.org/index.php?action=quotefast;quote={x};sesc={y};xml
- Your locked quote is ready in XML, with timestamp and correct link to the topic