Hi all new member here just got my new cordless plunge saw in the post today just a few questions I've never had a festool plunge saw so I noticed when the saw is sat in the track the blade hots the rubber splinter guard is this the first time you use it it cuts the guard so it's close to the blade ? And I've noticed at the front of the machine there's a clear plastic insert which can be swapped over for a green one what's this for many thanks