RJ11 to RJ10 Adapter for Weather Station Wind Sensor Replacement Compatibility

My wireless weather station wind sensor has a long flat two core lead terminating in a 4 position 2 contact  RJ10  (it's 7.65mm across) that plugs into the wireless sender unit.

After 9 years I've got to replace it after the anemometer's ball bearing race finally wore out. I found a likely looking replacement (Maplin N76NF) that's dirt cheap at £2.49 and worth a try.  It uses the same principle of a spinning magnet closing a reed switch so is compatible that way.

Problem is, it's terminated with an RJ11 plug (9.65mm wide) on its lead. Anyone know if an RJ11 (female) -> RJ10 (male) adaptor/ reducer is available anywhere?  Or I might end up just hacking into it and soldering wires together.

You mean something like thishttps://www.run-it-direct.co.uk/rj10-rj11-converters/rj11maletorj10femaleconverter/
or maybe thishttps://www.kenable.co.uk/product_info.php?products_id=7143

Now of course this assumes that the two manufacturers used compatible pinouts....

Elizabeth, thanks for looking those out!   The first one , I'd need the other way round, RJ11 female [receptacle to accept the new anemometer plug]  to RJ10 male plug [goes into the wireless Tx unit], 2nd one seems to have a BT plug.  I'd hope the wiring would go straight through.
Guess I'll have to get a crimp tool and do it myself, or just solder them instead.

Alan, don't bother with adapters, even though they may be the easy way out!  get yourself a crimp tool and a couple of RJ10s.  Yes, you have to assume the wiring is the same (if it's not. this is why you need a couple of plugs!) you say it's only 2 contact, and talk about a reed switch, so it should be good.  
Bottom end crimp tools are pretty cheap and should be fine for what you need.  I ahve been a telecomms tech  working on phones for the past 15 years so a good crimpt tool is one of my indispensible "tools of the trade" but I've bought a couple of cheap ones for smaller sites (to prevent those "D'Oh!" moment when I forget to bring my own).  and had no problems with them.It'l also be useful for repairing ethernet cables where the locking tang on the plug has broken.  Just keep the old plug till you've put the new one on, so you get the colours right....Having the right tool around, even if you only use it once in a blue moon, is a very good feeling...

David,  sounds like a good plan, I'll source a cheapie one on ebay and I found some RJ10 plugs (Kenable) too.  It's very satisfying, using the right tool for the right job and being prepared keeps my boy scout spirit alive!  Trouble is, I forget what tools I've got or where I've put them!

Here's what the reed looks like, typical of many wind sensors
Anemometer sensor reed JPG 70k