Op-1 encoder

OP-1
#1

Hi.
Week or so i decided one (right) encoder “rotating feelings” changed instead others encoders.
Any opinions where to buy replacement. I have necessary skill and equipment for resolder part. But need spare encoder.
Thanks

#2

http://www.operator-1.com/index.php?p=/discussion/64/op-1-internals .

#3

Thanks.
I saw this pics. But cannot identify type. It looks like alps but I’m not sure.