My bolt lift is very difficult. Cycling the bolt with the firing pin cocked is fine. When I release the firing pin the bolt lift is extremely hard. I have removed the spring and hardly any difference. I was advised to trim the spring to no avail. So I removed the spring altogether. I suspected the spring had nothing to do with it. I have disassembled the bolt many times and cleaned. Any thoughts on this problem would be appreciated. Sporter Mauser 98 wood stock 25/06